microblaze_v8: Open firmware files

Reviewed-by: Ingo Molnar <mingo@elte.hu>
Reviewed-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 1025 insertions, 0 deletions

diff --git a/arch/microblaze/kernel/prom_parse.c b/arch/microblaze/kernel/prom_parse.c
new file mode 100644
index 00000000000..ae0352ecd5a
--- /dev/null
+++ b/arch/microblaze/kernel/prom_parse.c
@@ -0,0 +1,1025 @@
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/pci_regs.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/etherdevice.h>
+#include <asm/prom.h>
+#include <asm/pci-bridge.h>
+
+#define PRu64	"%llx"
+
+/* Max address size we deal with */
+#define OF_MAX_ADDR_CELLS	4
+#define OF_CHECK_COUNTS(na, ns)	((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
+			(ns) > 0)
+
+static struct of_bus *of_match_bus(struct device_node *np);
+static int __of_address_to_resource(struct device_node *dev,
+		const u32 *addrp, u64 size, unsigned int flags,
+		struct resource *r);
+
+/* Debug utility */
+#ifdef DEBUG
+static void of_dump_addr(const char *s, const u32 *addr, int na)
+{
+	printk(KERN_INFO "%s", s);
+	while (na--)
+		printk(KERN_INFO " %08x", *(addr++));
+	printk(KERN_INFO "\n");
+}
+#else
+static void of_dump_addr(const char *s, const u32 *addr, int na) { }
+#endif
+
+/* Callbacks for bus specific translators */
+struct of_bus {
+	const char	*name;
+	const char	*addresses;
+	int		(*match)(struct device_node *parent);
+	void		(*count_cells)(struct device_node *child,
+					int *addrc, int *sizec);
+	u64		(*map)(u32 *addr, const u32 *range,
+				int na, int ns, int pna);
+	int		(*translate)(u32 *addr, u64 offset, int na);
+	unsigned int	(*get_flags)(const u32 *addr);
+};
+
+/*
+ * Default translator (generic bus)
+ */
+
+static void of_bus_default_count_cells(struct device_node *dev,
+					int *addrc, int *sizec)
+{
+	if (addrc)
+		*addrc = of_n_addr_cells(dev);
+	if (sizec)
+		*sizec = of_n_size_cells(dev);
+}
+
+static u64 of_bus_default_map(u32 *addr, const u32 *range,
+		int na, int ns, int pna)
+{
+	u64 cp, s, da;
+
+	cp = of_read_number(range, na);
+	s  = of_read_number(range + na + pna, ns);
+	da = of_read_number(addr, na);
+
+	pr_debug("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
+		cp, s, da);
+
+	if (da < cp || da >= (cp + s))
+		return OF_BAD_ADDR;
+	return da - cp;
+}
+
+static int of_bus_default_translate(u32 *addr, u64 offset, int na)
+{
+	u64 a = of_read_number(addr, na);
+	memset(addr, 0, na * 4);
+	a += offset;
+	if (na > 1)
+		addr[na - 2] = a >> 32;
+	addr[na - 1] = a & 0xffffffffu;
+
+	return 0;
+}
+
+static unsigned int of_bus_default_get_flags(const u32 *addr)
+{
+	return IORESOURCE_MEM;
+}
+
+#ifdef CONFIG_PCI
+/*
+ * PCI bus specific translator
+ */
+
+static int of_bus_pci_match(struct device_node *np)
+{
+	/* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
+	return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
+}
+
+static void of_bus_pci_count_cells(struct device_node *np,
+				int *addrc, int *sizec)
+{
+	if (addrc)
+		*addrc = 3;
+	if (sizec)
+		*sizec = 2;
+}
+
+static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna)
+{
+	u64 cp, s, da;
+
+	/* Check address type match */
+	if ((addr[0] ^ range[0]) & 0x03000000)
+		return OF_BAD_ADDR;
+
+	/* Read address values, skipping high cell */
+	cp = of_read_number(range + 1, na - 1);
+	s  = of_read_number(range + na + pna, ns);
+	da = of_read_number(addr + 1, na - 1);
+
+	pr_debug("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
+
+	if (da < cp || da >= (cp + s))
+		return OF_BAD_ADDR;
+	return da - cp;
+}
+
+static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
+{
+	return of_bus_default_translate(addr + 1, offset, na - 1);
+}
+
+static unsigned int of_bus_pci_get_flags(const u32 *addr)
+{
+	unsigned int flags = 0;
+	u32 w = addr[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;
+}
+
+const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
+			unsigned int *flags)
+{
+	const u32 *prop;
+	unsigned int psize;
+	struct device_node *parent;
+	struct of_bus *bus;
+	int onesize, i, na, ns;
+
+	/* Get parent & match bus type */
+	parent = of_get_parent(dev);
+	if (parent == NULL)
+		return NULL;
+	bus = of_match_bus(parent);
+	if (strcmp(bus->name, "pci")) {
+		of_node_put(parent);
+		return NULL;
+	}
+	bus->count_cells(dev, &na, &ns);
+	of_node_put(parent);
+	if (!OF_CHECK_COUNTS(na, ns))
+		return NULL;
+
+	/* Get "reg" or "assigned-addresses" property */
+	prop = of_get_property(dev, bus->addresses, &psize);
+	if (prop == NULL)
+		return NULL;
+	psize /= 4;
+
+	onesize = na + ns;
+	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
+		if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
+			if (size)
+				*size = of_read_number(prop + na, ns);
+			if (flags)
+				*flags = bus->get_flags(prop);
+			return prop;
+		}
+	return NULL;
+}
+EXPORT_SYMBOL(of_get_pci_address);
+
+int of_pci_address_to_resource(struct device_node *dev, int bar,
+				struct resource *r)
+{
+	const u32	*addrp;
+	u64		size;
+	unsigned int	flags;
+
+	addrp = of_get_pci_address(dev, bar, &size, &flags);
+	if (addrp == NULL)
+		return -EINVAL;
+	return __of_address_to_resource(dev, addrp, size, flags, r);
+}
+EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
+
+static u8 of_irq_pci_swizzle(u8 slot, u8 pin)
+{
+	return (((pin - 1) + slot) % 4) + 1;
+}
+
+int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
+{
+	struct device_node *dn, *ppnode;
+	struct pci_dev *ppdev;
+	u32 lspec;
+	u32 laddr[3];
+	u8 pin;
+	int rc;
+
+	/* Check if we have a device node, if yes, fallback to standard OF
+	 * parsing
+	 */
+	dn = pci_device_to_OF_node(pdev);
+	if (dn)
+		return of_irq_map_one(dn, 0, out_irq);
+
+	/* Ok, we don't, time to have fun. Let's start by building up an
+	 * interrupt spec.  we assume #interrupt-cells is 1, which is standard
+	 * for PCI. If you do different, then don't use that routine.
+	 */
+	rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
+	if (rc != 0)
+		return rc;
+	/* No pin, exit */
+	if (pin == 0)
+		return -ENODEV;
+
+	/* Now we walk up the PCI tree */
+	lspec = pin;
+	for (;;) {
+		/* Get the pci_dev of our parent */
+		ppdev = pdev->bus->self;
+
+		/* Ouch, it's a host bridge... */
+		if (ppdev == NULL) {
+			struct pci_controller *host;
+			host = pci_bus_to_host(pdev->bus);
+			ppnode = host ? host->arch_data : NULL;
+			/* No node for host bridge ? give up */
+			if (ppnode == NULL)
+				return -EINVAL;
+		} else
+			/* We found a P2P bridge, check if it has a node */
+			ppnode = pci_device_to_OF_node(ppdev);
+
+		/* Ok, we have found a parent with a device-node, hand over to
+		 * the OF parsing code.
+		 * We build a unit address from the linux device to be used for
+		 * resolution. Note that we use the linux bus number which may
+		 * not match your firmware bus numbering.
+		 * Fortunately, in most cases, interrupt-map-mask doesn't
+		 * include the bus number as part of the matching.
+		 * You should still be careful about that though if you intend
+		 * to rely on this function (you ship  a firmware that doesn't
+		 * create device nodes for all PCI devices).
+		 */
+		if (ppnode)
+			break;
+
+		/* We can only get here if we hit a P2P bridge with no node,
+		 * let's do standard swizzling and try again
+		 */
+		lspec = of_irq_pci_swizzle(PCI_SLOT(pdev->devfn), lspec);
+		pdev = ppdev;
+	}
+
+	laddr[0] = (pdev->bus->number << 16)
+		| (pdev->devfn << 8);
+	laddr[1]  = laddr[2] = 0;
+	return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq);
+}
+EXPORT_SYMBOL_GPL(of_irq_map_pci);
+#endif /* CONFIG_PCI */
+
+/*
+ * ISA bus specific translator
+ */
+
+static int of_bus_isa_match(struct device_node *np)
+{
+	return !strcmp(np->name, "isa");
+}
+
+static void of_bus_isa_count_cells(struct device_node *child,
+				int *addrc, int *sizec)
+{
+	if (addrc)
+		*addrc = 2;
+	if (sizec)
+		*sizec = 1;
+}
+
+static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna)
+{
+	u64 cp, s, da;
+
+	/* Check address type match */
+	if ((addr[0] ^ range[0]) & 0x00000001)
+		return OF_BAD_ADDR;
+
+	/* Read address values, skipping high cell */
+	cp = of_read_number(range + 1, na - 1);
+	s  = of_read_number(range + na + pna, ns);
+	da = of_read_number(addr + 1, na - 1);
+
+	pr_debug("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
+
+	if (da < cp || da >= (cp + s))
+		return OF_BAD_ADDR;
+	return da - cp;
+}
+
+static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
+{
+	return of_bus_default_translate(addr + 1, offset, na - 1);
+}
+
+static unsigned int of_bus_isa_get_flags(const u32 *addr)
+{
+	unsigned int flags = 0;
+	u32 w = addr[0];
+
+	if (w & 1)
+		flags |= IORESOURCE_IO;
+	else
+		flags |= IORESOURCE_MEM;
+	return flags;
+}
+
+/*
+ * Array of bus specific translators
+ */
+
+static struct of_bus of_busses[] = {
+#ifdef CONFIG_PCI
+	/* PCI */
+	{
+		.name = "pci",
+		.addresses = "assigned-addresses",
+		.match = of_bus_pci_match,
+		.count_cells = of_bus_pci_count_cells,
+		.map = of_bus_pci_map,
+		.translate = of_bus_pci_translate,
+		.get_flags = of_bus_pci_get_flags,
+	},
+#endif /* CONFIG_PCI */
+	/* ISA */
+	{
+		.name = "isa",
+		.addresses = "reg",
+		.match = of_bus_isa_match,
+		.count_cells = of_bus_isa_count_cells,
+		.map = of_bus_isa_map,
+		.translate = of_bus_isa_translate,
+		.get_flags = of_bus_isa_get_flags,
+	},
+	/* Default */
+	{
+		.name = "default",
+		.addresses = "reg",
+		.match = NULL,
+		.count_cells = of_bus_default_count_cells,
+		.map = of_bus_default_map,
+		.translate = of_bus_default_translate,
+		.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 of_translate_one(struct device_node *parent, struct of_bus *bus,
+			struct of_bus *pbus, u32 *addr,
+			int na, int ns, int pna)
+{
+	const u32 *ranges;
+	unsigned int rlen;
+	int rone;
+	u64 offset = OF_BAD_ADDR;
+
+	/* Normally, an absence of a "ranges" property means we are
+	 * crossing a non-translatable boundary, and thus the addresses
+	 * below the current not cannot be converted to CPU physical ones.
+	 * Unfortunately, while this is very clear in the spec, it's not
+	 * what Apple understood, and they do have things like /uni-n or
+	 * /ht nodes with no "ranges" property and a lot of perfectly
+	 * useable mapped devices below them. Thus we treat the absence of
+	 * "ranges" as equivalent to an empty "ranges" property which means
+	 * a 1:1 translation at that level. It's up to the caller not to try
+	 * to translate addresses that aren't supposed to be translated in
+	 * the first place. --BenH.
+	 */
+	ranges = of_get_property(parent, "ranges", (int *) &rlen);
+	if (ranges == NULL || rlen == 0) {
+		offset = of_read_number(addr, na);
+		memset(addr, 0, pna * 4);
+		pr_debug("OF: no ranges, 1:1 translation\n");
+		goto finish;
+	}
+
+	pr_debug("OF: walking ranges...\n");
+
+	/* Now walk through the ranges */
+	rlen /= 4;
+	rone = na + pna + ns;
+	for (; rlen >= rone; rlen -= rone, ranges += rone) {
+		offset = bus->map(addr, ranges, na, ns, pna);
+		if (offset != OF_BAD_ADDR)
+			break;
+	}
+	if (offset == OF_BAD_ADDR) {
+		pr_debug("OF: not found !\n");
+		return 1;
+	}
+	memcpy(addr, ranges + na, 4 * pna);
+
+ finish:
+	of_dump_addr("OF: parent translation for:", addr, pna);
+	pr_debug("OF: with offset: "PRu64"\n", offset);
+
+	/* Translate it into parent bus space */
+	return pbus->translate(addr, offset, pna);
+}
+
+/*
+ * Translate an address from the device-tree into a CPU physical address,
+ * this walks up the tree and applies the various bus mappings on the
+ * way.
+ *
+ * Note: We consider that crossing any level with #size-cells == 0 to mean
+ * that translation is impossible (that is we are not dealing with a value
+ * that can be mapped to a cpu physical address). This is not really specified
+ * that way, but this is traditionally the way IBM at least do things
+ */
+u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
+{
+	struct device_node *parent = NULL;
+	struct of_bus *bus, *pbus;
+	u32 addr[OF_MAX_ADDR_CELLS];
+	int na, ns, pna, pns;
+	u64 result = OF_BAD_ADDR;
+
+	pr_debug("OF: ** translation for device %s **\n", dev->full_name);
+
+	/* Increase refcount at current level */
+	of_node_get(dev);
+
+	/* Get parent & match bus type */
+	parent = of_get_parent(dev);
+	if (parent == NULL)
+		goto bail;
+	bus = of_match_bus(parent);
+
+	/* Cound address cells & copy address locally */
+	bus->count_cells(dev, &na, &ns);
+	if (!OF_CHECK_COUNTS(na, ns)) {
+		printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
+			dev->full_name);
+		goto bail;
+	}
+	memcpy(addr, in_addr, na * 4);
+
+	pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
+		bus->name, na, ns, parent->full_name);
+	of_dump_addr("OF: translating address:", addr, na);
+
+	/* Translate */
+	for (;;) {
+		/* Switch to parent bus */
+		of_node_put(dev);
+		dev = parent;
+		parent = of_get_parent(dev);
+
+		/* If root, we have finished */
+		if (parent == NULL) {
+			pr_debug("OF: reached root node\n");
+			result = of_read_number(addr, na);
+			break;
+		}
+
+		/* Get new parent bus and counts */
+		pbus = of_match_bus(parent);
+		pbus->count_cells(dev, &pna, &pns);
+		if (!OF_CHECK_COUNTS(pna, pns)) {
+			printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
+				dev->full_name);
+			break;
+		}
+
+		pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
+			pbus->name, pna, pns, parent->full_name);
+
+		/* Apply bus translation */
+		if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
+			break;
+
+		/* Complete the move up one level */
+		na = pna;
+		ns = pns;
+		bus = pbus;
+
+		of_dump_addr("OF: one level translation:", addr, na);
+	}
+ bail:
+	of_node_put(parent);
+	of_node_put(dev);
+
+	return result;
+}
+EXPORT_SYMBOL(of_translate_address);
+
+const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
+			unsigned int *flags)
+{
+	const u32 *prop;
+	unsigned int psize;
+	struct device_node *parent;
+	struct of_bus *bus;
+	int onesize, i, na, ns;
+
+	/* Get parent & match bus type */
+	parent = of_get_parent(dev);
+	if (parent == NULL)
+		return NULL;
+	bus = of_match_bus(parent);
+	bus->count_cells(dev, &na, &ns);
+	of_node_put(parent);
+	if (!OF_CHECK_COUNTS(na, ns))
+		return NULL;
+
+	/* Get "reg" or "assigned-addresses" property */
+	prop = of_get_property(dev, bus->addresses, (int *) &psize);
+	if (prop == NULL)
+		return NULL;
+	psize /= 4;
+
+	onesize = na + ns;
+	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
+		if (i == index) {
+			if (size)
+				*size = of_read_number(prop + na, ns);
+			if (flags)
+				*flags = bus->get_flags(prop);
+			return prop;
+		}
+	return NULL;
+}
+EXPORT_SYMBOL(of_get_address);
+
+static int __of_address_to_resource(struct device_node *dev, const u32 *addrp,
+				u64 size, unsigned int flags,
+				struct resource *r)
+{
+	u64 taddr;
+
+	if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
+		return -EINVAL;
+	taddr = of_translate_address(dev, addrp);
+	if (taddr == OF_BAD_ADDR)
+		return -EINVAL;
+	memset(r, 0, sizeof(struct resource));
+	if (flags & IORESOURCE_IO) {
+		unsigned long port;
+		port = -1; /* pci_address_to_pio(taddr); */
+		if (port == (unsigned long)-1)
+			return -EINVAL;
+		r->start = port;
+		r->end = port + size - 1;
+	} else {
+		r->start = taddr;
+		r->end = taddr + size - 1;
+	}
+	r->flags = flags;
+	r->name = dev->name;
+	return 0;
+}
+
+int of_address_to_resource(struct device_node *dev, int index,
+			struct resource *r)
+{
+	const u32	*addrp;
+	u64		size;
+	unsigned int	flags;
+
+	addrp = of_get_address(dev, index, &size, &flags);
+	if (addrp == NULL)
+		return -EINVAL;
+	return __of_address_to_resource(dev, addrp, size, flags, r);
+}
+EXPORT_SYMBOL_GPL(of_address_to_resource);
+
+void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
+		unsigned long *busno, unsigned long *phys, unsigned long *size)
+{
+	const u32 *dma_window;
+	u32 cells;
+	const unsigned char *prop;
+
+	dma_window = dma_window_prop;
+
+	/* busno is always one cell */
+	*busno = *(dma_window++);
+
+	prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
+	if (!prop)
+		prop = of_get_property(dn, "#address-cells", NULL);
+
+	cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
+	*phys = of_read_number(dma_window, cells);
+
+	dma_window += cells;
+
+	prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
+	cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
+	*size = of_read_number(dma_window, cells);
+}
+
+/*
+ * Interrupt remapper
+ */
+
+static unsigned int of_irq_workarounds;
+static struct device_node *of_irq_dflt_pic;
+
+static struct device_node *of_irq_find_parent(struct device_node *child)
+{
+	struct device_node *p;
+	const phandle *parp;
+
+	if (!of_node_get(child))
+		return NULL;
+
+	do {
+		parp = of_get_property(child, "interrupt-parent", NULL);
+		if (parp == NULL)
+			p = of_get_parent(child);
+		else {
+			if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
+				p = of_node_get(of_irq_dflt_pic);
+			else
+				p = of_find_node_by_phandle(*parp);
+		}
+		of_node_put(child);
+		child = p;
+	} while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
+
+	return p;
+}
+
+/* This doesn't need to be called if you don't have any special workaround
+ * flags to pass
+ */
+void of_irq_map_init(unsigned int flags)
+{
+	of_irq_workarounds = flags;
+
+	/* OldWorld, don't bother looking at other things */
+	if (flags & OF_IMAP_OLDWORLD_MAC)
+		return;
+
+	/* If we don't have phandles, let's try to locate a default interrupt
+	 * controller (happens when booting with BootX). We do a first match
+	 * here, hopefully, that only ever happens on machines with one
+	 * controller.
+	 */
+	if (flags & OF_IMAP_NO_PHANDLE) {
+		struct device_node *np;
+
+		for (np = NULL; (np = of_find_all_nodes(np)) != NULL;) {
+			if (of_get_property(np, "interrupt-controller", NULL)
+				== NULL)
+				continue;
+			/* Skip /chosen/interrupt-controller */
+			if (strcmp(np->name, "chosen") == 0)
+				continue;
+			/* It seems like at least one person on this planet
+			 * wants to use BootX on a machine with an AppleKiwi
+			 * controller which happens to pretend to be an
+			 * interrupt controller too.
+			 */
+			if (strcmp(np->name, "AppleKiwi") == 0)
+				continue;
+			/* I think we found one ! */
+			of_irq_dflt_pic = np;
+			break;
+		}
+	}
+
+}
+
+int of_irq_map_raw(struct device_node *parent, const u32 *intspec, u32 ointsize,
+		const u32 *addr, struct of_irq *out_irq)
+{
+	struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
+	const u32 *tmp, *imap, *imask;
+	u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
+	int imaplen, match, i;
+
+	pr_debug("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],"
+		"ointsize=%d\n",
+		parent->full_name, intspec[0], intspec[1], ointsize);
+
+	ipar = of_node_get(parent);
+
+	/* First get the #interrupt-cells property of the current cursor
+	 * that tells us how to interpret the passed-in intspec. If there
+	 * is none, we are nice and just walk up the tree
+	 */
+	do {
+		tmp = of_get_property(ipar, "#interrupt-cells", NULL);
+		if (tmp != NULL) {
+			intsize = *tmp;
+			break;
+		}
+		tnode = ipar;
+		ipar = of_irq_find_parent(ipar);
+		of_node_put(tnode);
+	} while (ipar);
+	if (ipar == NULL) {
+		pr_debug(" -> no parent found !\n");
+		goto fail;
+	}
+
+	pr_debug("of_irq_map_raw: ipar=%s, size=%d\n",
+			ipar->full_name, intsize);
+
+	if (ointsize != intsize)
+		return -EINVAL;
+
+	/* Look for this #address-cells. We have to implement the old linux
+	 * trick of looking for the parent here as some device-trees rely on it
+	 */
+	old = of_node_get(ipar);
+	do {
+		tmp = of_get_property(old, "#address-cells", NULL);
+		tnode = of_get_parent(old);
+		of_node_put(old);
+		old = tnode;
+	} while (old && tmp == NULL);
+	of_node_put(old);
+	old = NULL;
+	addrsize = (tmp == NULL) ? 2 : *tmp;
+
+	pr_debug(" -> addrsize=%d\n", addrsize);
+
+	/* Now start the actual "proper" walk of the interrupt tree */
+	while (ipar != NULL) {
+		/* Now check if cursor is an interrupt-controller and if it is
+		 * then we are done
+		 */
+		if (of_get_property(ipar, "interrupt-controller", NULL) !=
+				NULL) {
+			pr_debug(" -> got it !\n");
+			memcpy(out_irq->specifier, intspec,
+				intsize * sizeof(u32));
+			out_irq->size = intsize;
+			out_irq->controller = ipar;
+			of_node_put(old);
+			return 0;
+		}
+
+		/* Now look for an interrupt-map */
+		imap = of_get_property(ipar, "interrupt-map", &imaplen);
+		/* No interrupt map, check for an interrupt parent */
+		if (imap == NULL) {
+			pr_debug(" -> no map, getting parent\n");
+			newpar = of_irq_find_parent(ipar);
+			goto skiplevel;
+		}
+		imaplen /= sizeof(u32);
+
+		/* Look for a mask */
+		imask = of_get_property(ipar, "interrupt-map-mask", NULL);
+
+		/* If we were passed no "reg" property and we attempt to parse
+		 * an interrupt-map, then #address-cells must be 0.
+		 * Fail if it's not.
+		 */
+		if (addr == NULL && addrsize != 0) {
+			pr_debug(" -> no reg passed in when needed !\n");
+			goto fail;
+		}
+
+		/* Parse interrupt-map */
+		match = 0;
+		while (imaplen > (addrsize + intsize + 1) && !match) {
+			/* Compare specifiers */
+			match = 1;
+			for (i = 0; i < addrsize && match; ++i) {
+				u32 mask = imask ? imask[i] : 0xffffffffu;
+				match = ((addr[i] ^ imap[i]) & mask) == 0;
+			}
+			for (; i < (addrsize + intsize) && match; ++i) {
+				u32 mask = imask ? imask[i] : 0xffffffffu;
+				match =
+					((intspec[i-addrsize] ^ imap[i])
+						& mask) == 0;
+			}
+			imap += addrsize + intsize;
+			imaplen -= addrsize + intsize;
+
+			pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
+
+			/* Get the interrupt parent */
+			if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
+				newpar = of_node_get(of_irq_dflt_pic);
+			else
+				newpar =
+					of_find_node_by_phandle((phandle)*imap);
+			imap++;
+			--imaplen;
+
+			/* Check if not found */
+			if (newpar == NULL) {
+				pr_debug(" -> imap parent not found !\n");
+				goto fail;
+			}
+
+			/* Get #interrupt-cells and #address-cells of new
+			 * parent
+			 */
+			tmp = of_get_property(newpar, "#interrupt-cells", NULL);
+			if (tmp == NULL) {
+				pr_debug(" -> parent lacks "
+						"#interrupt-cells!\n");
+				goto fail;
+			}
+			newintsize = *tmp;
+			tmp = of_get_property(newpar, "#address-cells", NULL);
+			newaddrsize = (tmp == NULL) ? 0 : *tmp;
+
+			pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
+				newintsize, newaddrsize);
+
+			/* Check for malformed properties */
+			if (imaplen < (newaddrsize + newintsize))
+				goto fail;
+
+			imap += newaddrsize + newintsize;
+			imaplen -= newaddrsize + newintsize;
+
+			pr_debug(" -> imaplen=%d\n", imaplen);
+		}
+		if (!match)
+			goto fail;
+
+		of_node_put(old);
+		old = of_node_get(newpar);
+		addrsize = newaddrsize;
+		intsize = newintsize;
+		intspec = imap - intsize;
+		addr = intspec - addrsize;
+
+skiplevel:
+		/* Iterate again with new parent */
+		pr_debug(" -> new parent: %s\n",
+				newpar ? newpar->full_name : "<>");
+		of_node_put(ipar);
+		ipar = newpar;
+		newpar = NULL;
+	}
+fail:
+	of_node_put(ipar);
+	of_node_put(old);
+	of_node_put(newpar);
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(of_irq_map_raw);
+
+int of_irq_map_one(struct device_node *device,
+			int index, struct of_irq *out_irq)
+{
+	struct device_node *p;
+	const u32 *intspec, *tmp, *addr;
+	u32 intsize, intlen;
+	int res;
+
+	pr_debug("of_irq_map_one: dev=%s, index=%d\n",
+			device->full_name, index);
+
+	/* Get the interrupts property */
+	intspec = of_get_property(device, "interrupts", (int *) &intlen);
+	if (intspec == NULL)
+		return -EINVAL;
+	intlen /= sizeof(u32);
+
+	pr_debug(" intspec=%d intlen=%d\n", *intspec, intlen);
+
+	/* Get the reg property (if any) */
+	addr = of_get_property(device, "reg", NULL);
+
+	/* Look for the interrupt parent. */
+	p = of_irq_find_parent(device);
+	if (p == NULL)
+		return -EINVAL;
+
+	/* Get size of interrupt specifier */
+	tmp = of_get_property(p, "#interrupt-cells", NULL);
+	if (tmp == NULL) {
+		of_node_put(p);
+		return -EINVAL;
+	}
+	intsize = *tmp;
+
+	pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
+
+	/* Check index */
+	if ((index + 1) * intsize > intlen)
+		return -EINVAL;
+
+	/* Get new specifier and map it */
+	res = of_irq_map_raw(p, intspec + index * intsize, intsize,
+				addr, out_irq);
+	of_node_put(p);
+	return res;
+}
+EXPORT_SYMBOL_GPL(of_irq_map_one);
+
+/**
+ * Search the device tree for the best MAC address to use.  'mac-address' is
+ * checked first, because that is supposed to contain to "most recent" MAC
+ * address. If that isn't set, then 'local-mac-address' is checked next,
+ * because that is the default address.  If that isn't set, then the obsolete
+ * 'address' is checked, just in case we're using an old device tree.
+ *
+ * Note that the 'address' property is supposed to contain a virtual address of
+ * the register set, but some DTS files have redefined that property to be the
+ * MAC address.
+ *
+ * All-zero MAC addresses are rejected, because those could be properties that
+ * exist in the device tree, but were not set by U-Boot.  For example, the
+ * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
+ * addresses.  Some older U-Boots only initialized 'local-mac-address'.  In
+ * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
+ * but is all zeros.
+*/
+const void *of_get_mac_address(struct device_node *np)
+{
+	struct property *pp;
+
+	pp = of_find_property(np, "mac-address", NULL);
+	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+		return pp->value;
+
+	pp = of_find_property(np, "local-mac-address", NULL);
+	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+		return pp->value;
+
+	pp = of_find_property(np, "address", NULL);
+	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
+		return pp->value;
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_get_mac_address);
+
+int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
+{
+	struct of_irq out_irq;
+	int irq;
+	int res;
+
+	res = of_irq_map_one(dev, index, &out_irq);
+
+	/* Get irq for the device */
+	if (res) {
+		pr_debug("IRQ not found... code = %d", res);
+		return NO_IRQ;
+	}
+	/* Assuming single interrupt controller... */
+	irq = out_irq.specifier[0];
+
+	pr_debug("IRQ found = %d", irq);
+
+	/* Only dereference the resource if both the
+	 * resource and the irq are valid. */
+	if (r && irq != NO_IRQ) {
+		r->start = r->end = irq;
+		r->flags = IORESOURCE_IRQ;
+	}
+
+	return irq;
+}
+EXPORT_SYMBOL_GPL(of_irq_to_resource);
+
+void __iomem *of_iomap(struct device_node *np, int index)
+{
+	struct resource res;
+
+	if (of_address_to_resource(np, index, &res))
+		return NULL;
+
+	return ioremap(res.start, 1 + res.end - res.start);
+}
+EXPORT_SYMBOL(of_iomap);