1 files changed, 1447 insertions, 0 deletions

diff --git a/arch/ppc/syslib/prom.c b/arch/ppc/syslib/prom.c
new file mode 100644
index 000000000000..2c64ed627475
--- /dev/null
+++ b/arch/ppc/syslib/prom.c
@@ -0,0 +1,1447 @@
+/*
+ * Procedures for interfacing to the Open Firmware PROM on
+ * Power Macintosh computers.
+ *
+ * In particular, we are interested in the device tree
+ * and in using some of its services (exit, write to stdout).
+ *
+ * Paul Mackerras       August 1996.
+ * Copyright (C) 1996 Paul Mackerras.
+ */
+#include <stdarg.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/version.h>
+#include <linux/threads.h>
+#include <linux/spinlock.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+
+#include <asm/sections.h>
+#include <asm/prom.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/bootx.h>
+#include <asm/system.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+#include <asm/btext.h>
+#include <asm/pci-bridge.h>
+#include <asm/open_pic.h>
+
+
+struct pci_address {
+        unsigned a_hi;
+        unsigned a_mid;
+        unsigned a_lo;
+};
+
+struct pci_reg_property {
+        struct pci_address addr;
+        unsigned size_hi;
+        unsigned size_lo;
+};
+
+struct isa_reg_property {
+        unsigned space;
+        unsigned address;
+        unsigned size;
+};
+
+typedef unsigned long interpret_func(struct device_node *, unsigned long,
+                                     int, int);
+static interpret_func interpret_pci_props;
+static interpret_func interpret_dbdma_props;
+static interpret_func interpret_isa_props;
+static interpret_func interpret_macio_props;
+static interpret_func interpret_root_props;
+
+extern char *klimit;
+
+/* Set for a newworld or CHRP machine */
+int use_of_interrupt_tree;
+struct device_node *dflt_interrupt_controller;
+int num_interrupt_controllers;
+
+int pmac_newworld;
+
+extern unsigned int rtas_entry;  /* physical pointer */
+
+extern struct device_node *allnodes;
+
+static unsigned long finish_node(struct device_node *, unsigned long,
+                                 interpret_func *, int, int);
+static unsigned long finish_node_interrupts(struct device_node *, unsigned long);
+static struct device_node *find_phandle(phandle);
+
+extern void enter_rtas(void *);
+void phys_call_rtas(int, int, int, ...);
+
+extern char cmd_line[512];      /* XXX */
+extern boot_infos_t *boot_infos;
+unsigned long dev_tree_size;
+
+void __openfirmware
+phys_call_rtas(int service, int nargs, int nret, ...)
+{
+        va_list list;
+        union {
+                unsigned long words[16];
+                double align;
+        } u;
+        void (*rtas)(void *, unsigned long);
+        int i;
+
+        u.words[0] = service;
+        u.words[1] = nargs;
+        u.words[2] = nret;
+        va_start(list, nret);
+        for (i = 0; i < nargs; ++i)
+                u.words[i+3] = va_arg(list, unsigned long);
+        va_end(list);
+
+        rtas = (void (*)(void *, unsigned long)) rtas_entry;
+        rtas(&u, rtas_data);
+}
+
+/*
+ * finish_device_tree is called once things are running normally
+ * (i.e. with text and data mapped to the address they were linked at).
+ * It traverses the device tree and fills in the name, type,
+ * {n_}addrs and {n_}intrs fields of each node.
+ */
+void __init
+finish_device_tree(void)
+{
+        unsigned long mem = (unsigned long) klimit;
+        struct device_node *np;
+
+        /* All newworld pmac machines and CHRPs now use the interrupt tree */
+        for (np = allnodes; np != NULL; np = np->allnext) {
+                if (get_property(np, "interrupt-parent", NULL)) {
+                        use_of_interrupt_tree = 1;
+                        break;
+                }
+        }
+        if (_machine == _MACH_Pmac && use_of_interrupt_tree)
+                pmac_newworld = 1;
+
+#ifdef CONFIG_BOOTX_TEXT
+        if (boot_infos && pmac_newworld) {
+                prom_print("WARNING ! BootX/miBoot booting is not supported on this machine\n");
+                prom_print("          You should use an Open Firmware bootloader\n");
+        }
+#endif /* CONFIG_BOOTX_TEXT */
+
+        if (use_of_interrupt_tree) {
+                /*
+                 * We want to find out here how many interrupt-controller
+                 * nodes there are, and if we are booted from BootX,
+                 * we need a pointer to the first (and hopefully only)
+                 * such node.  But we can't use find_devices here since
+                 * np->name has not been set yet.  -- paulus
+                 */
+                int n = 0;
+                char *name, *ic;
+                int iclen;
+
+                for (np = allnodes; np != NULL; np = np->allnext) {
+                        ic = get_property(np, "interrupt-controller", &iclen);
+                        name = get_property(np, "name", NULL);
+                        /* checking iclen makes sure we don't get a false
+                           match on /chosen.interrupt_controller */
+                        if ((name != NULL
+                             && strcmp(name, "interrupt-controller") == 0)
+                            || (ic != NULL && iclen == 0 && strcmp(name, "AppleKiwi"))) {
+                                if (n == 0)
+                                        dflt_interrupt_controller = np;
+                                ++n;
+                        }
+                }
+                num_interrupt_controllers = n;
+        }
+
+        mem = finish_node(allnodes, mem, NULL, 1, 1);
+        dev_tree_size = mem - (unsigned long) allnodes;
+        klimit = (char *) mem;
+}
+
+static unsigned long __init
+finish_node(struct device_node *np, unsigned long mem_start,
+            interpret_func *ifunc, int naddrc, int nsizec)
+{
+        struct device_node *child;
+        int *ip;
+
+        np->name = get_property(np, "name", NULL);
+        np->type = get_property(np, "device_type", NULL);
+
+        if (!np->name)
+                np->name = "<NULL>";
+        if (!np->type)
+                np->type = "<NULL>";
+
+        /* get the device addresses and interrupts */
+        if (ifunc != NULL)
+                mem_start = ifunc(np, mem_start, naddrc, nsizec);
+
+        if (use_of_interrupt_tree)
+                mem_start = finish_node_interrupts(np, mem_start);
+
+        /* Look for #address-cells and #size-cells properties. */
+        ip = (int *) get_property(np, "#address-cells", NULL);
+        if (ip != NULL)
+                naddrc = *ip;
+        ip = (int *) get_property(np, "#size-cells", NULL);
+        if (ip != NULL)
+                nsizec = *ip;
+
+        if (np->parent == NULL)
+                ifunc = interpret_root_props;
+        else if (np->type == 0)
+                ifunc = NULL;
+        else if (!strcmp(np->type, "pci") || !strcmp(np->type, "vci"))
+                ifunc = interpret_pci_props;
+        else if (!strcmp(np->type, "dbdma"))
+                ifunc = interpret_dbdma_props;
+        else if (!strcmp(np->type, "mac-io")
+                 || ifunc == interpret_macio_props)
+                ifunc = interpret_macio_props;
+        else if (!strcmp(np->type, "isa"))
+                ifunc = interpret_isa_props;
+        else if (!strcmp(np->name, "uni-n") || !strcmp(np->name, "u3"))
+                ifunc = interpret_root_props;
+        else if (!((ifunc == interpret_dbdma_props
+                    || ifunc == interpret_macio_props)
+                   && (!strcmp(np->type, "escc")
+                       || !strcmp(np->type, "media-bay"))))
+                ifunc = NULL;
+
+        /* if we were booted from BootX, convert the full name */
+        if (boot_infos
+            && strncmp(np->full_name, "Devices:device-tree", 19) == 0) {
+                if (np->full_name[19] == 0) {
+                        strcpy(np->full_name, "/");
+                } else if (np->full_name[19] == ':') {
+                        char *p = np->full_name + 19;
+                        np->full_name = p;
+                        for (; *p; ++p)
+                                if (*p == ':')
+                                        *p = '/';
+                }
+        }
+
+        for (child = np->child; child != NULL; child = child->sibling)
+                mem_start = finish_node(child, mem_start, ifunc,
+                                        naddrc, nsizec);
+
+        return mem_start;
+}
+
+/*
+ * Find the interrupt parent of a node.
+ */
+static struct device_node * __init
+intr_parent(struct device_node *p)
+{
+        phandle *parp;
+
+        parp = (phandle *) get_property(p, "interrupt-parent", NULL);
+        if (parp == NULL)
+                return p->parent;
+        p = find_phandle(*parp);
+        if (p != NULL)
+                return p;
+        /*
+         * On a powermac booted with BootX, we don't get to know the
+         * phandles for any nodes, so find_phandle will return NULL.
+         * Fortunately these machines only have one interrupt controller
+         * so there isn't in fact any ambiguity.  -- paulus
+         */
+        if (num_interrupt_controllers == 1)
+                p = dflt_interrupt_controller;
+        return p;
+}
+
+/*
+ * Find out the size of each entry of the interrupts property
+ * for a node.
+ */
+static int __init
+prom_n_intr_cells(struct device_node *np)
+{
+        struct device_node *p;
+        unsigned int *icp;
+
+        for (p = np; (p = intr_parent(p)) != NULL; ) {
+                icp = (unsigned int *)
+                        get_property(p, "#interrupt-cells", NULL);
+                if (icp != NULL)
+                        return *icp;
+                if (get_property(p, "interrupt-controller", NULL) != NULL
+                    || get_property(p, "interrupt-map", NULL) != NULL) {
+                        printk("oops, node %s doesn't have #interrupt-cells\n",
+                               p->full_name);
+                        return 1;
+                }
+        }
+        printk("prom_n_intr_cells failed for %s\n", np->full_name);
+        return 1;
+}
+
+/*
+ * Map an interrupt from a device up to the platform interrupt
+ * descriptor.
+ */
+static int __init
+map_interrupt(unsigned int **irq, struct device_node **ictrler,
+              struct device_node *np, unsigned int *ints, int nintrc)
+{
+        struct device_node *p, *ipar;
+        unsigned int *imap, *imask, *ip;
+        int i, imaplen, match;
+        int newintrc = 1, newaddrc = 1;
+        unsigned int *reg;
+        int naddrc;
+
+        reg = (unsigned int *) get_property(np, "reg", NULL);
+        naddrc = prom_n_addr_cells(np);
+        p = intr_parent(np);
+        while (p != NULL) {
+                if (get_property(p, "interrupt-controller", NULL) != NULL)
+                        /* this node is an interrupt controller, stop here */
+                        break;
+                imap = (unsigned int *)
+                        get_property(p, "interrupt-map", &imaplen);
+                if (imap == NULL) {
+                        p = intr_parent(p);
+                        continue;
+                }
+                imask = (unsigned int *)
+                        get_property(p, "interrupt-map-mask", NULL);
+                if (imask == NULL) {
+                        printk("oops, %s has interrupt-map but no mask\n",
+                               p->full_name);
+                        return 0;
+                }
+                imaplen /= sizeof(unsigned int);
+                match = 0;
+                ipar = NULL;
+                while (imaplen > 0 && !match) {
+                        /* check the child-interrupt field */
+                        match = 1;
+                        for (i = 0; i < naddrc && match; ++i)
+                                match = ((reg[i] ^ imap[i]) & imask[i]) == 0;
+                        for (; i < naddrc + nintrc && match; ++i)
+                                match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0;
+                        imap += naddrc + nintrc;
+                        imaplen -= naddrc + nintrc;
+                        /* grab the interrupt parent */
+                        ipar = find_phandle((phandle) *imap++);
+                        --imaplen;
+                        if (ipar == NULL && num_interrupt_controllers == 1)
+                                /* cope with BootX not giving us phandles */
+                                ipar = dflt_interrupt_controller;
+                        if (ipar == NULL) {
+                                printk("oops, no int parent %x in map of %s\n",
+                                       imap[-1], p->full_name);
+                                return 0;
+                        }
+                        /* find the parent's # addr and intr cells */
+                        ip = (unsigned int *)
+                                get_property(ipar, "#interrupt-cells", NULL);
+                        if (ip == NULL) {
+                                printk("oops, no #interrupt-cells on %s\n",
+                                       ipar->full_name);
+                                return 0;
+                        }
+                        newintrc = *ip;
+                        ip = (unsigned int *)
+                                get_property(ipar, "#address-cells", NULL);
+                        newaddrc = (ip == NULL)? 0: *ip;
+                        imap += newaddrc + newintrc;
+                        imaplen -= newaddrc + newintrc;
+                }
+                if (imaplen < 0) {
+                        printk("oops, error decoding int-map on %s, len=%d\n",
+                               p->full_name, imaplen);
+                        return 0;
+                }
+                if (!match) {
+                        printk("oops, no match in %s int-map for %s\n",
+                               p->full_name, np->full_name);
+                        return 0;
+                }
+                p = ipar;
+                naddrc = newaddrc;
+                nintrc = newintrc;
+                ints = imap - nintrc;
+                reg = ints - naddrc;
+        }
+        if (p == NULL)
+                printk("hmmm, int tree for %s doesn't have ctrler\n",
+                       np->full_name);
+        *irq = ints;
+        *ictrler = p;
+        return nintrc;
+}
+
+/*
+ * New version of finish_node_interrupts.
+ */
+static unsigned long __init
+finish_node_interrupts(struct device_node *np, unsigned long mem_start)
+{
+        unsigned int *ints;
+        int intlen, intrcells;
+        int i, j, n, offset;
+        unsigned int *irq;
+        struct device_node *ic;
+
+        ints = (unsigned int *) get_property(np, "interrupts", &intlen);
+        if (ints == NULL)
+                return mem_start;
+        intrcells = prom_n_intr_cells(np);
+        intlen /= intrcells * sizeof(unsigned int);
+        np->n_intrs = intlen;
+        np->intrs = (struct interrupt_info *) mem_start;
+        mem_start += intlen * sizeof(struct interrupt_info);
+
+        for (i = 0; i < intlen; ++i) {
+                np->intrs[i].line = 0;
+                np->intrs[i].sense = 1;
+                n = map_interrupt(&irq, &ic, np, ints, intrcells);
+                if (n <= 0)
+                        continue;
+                offset = 0;
+                /*
+                 * On a CHRP we have an 8259 which is subordinate to
+                 * the openpic in the interrupt tree, but we want the
+                 * openpic's interrupt numbers offsetted, not the 8259's.
+                 * So we apply the offset if the controller is at the
+                 * root of the interrupt tree, i.e. has no interrupt-parent.
+                 * This doesn't cope with the general case of multiple
+                 * cascaded interrupt controllers, but then neither will
+                 * irq.c at the moment either.  -- paulus
+                 * The G5 triggers that code, I add a machine test. On
+                 * those machines, we want to offset interrupts from the
+                 * second openpic by 128 -- BenH
+                 */
+                if (_machine != _MACH_Pmac && num_interrupt_controllers > 1
+                    && ic != NULL
+                    && get_property(ic, "interrupt-parent", NULL) == NULL)
+                        offset = 16;
+                else if (_machine == _MACH_Pmac && num_interrupt_controllers > 1
+                         && ic != NULL && ic->parent != NULL) {
+                        char *name = get_property(ic->parent, "name", NULL);
+                        if (name && !strcmp(name, "u3"))
+                                offset = 128;
+                }
+
+                np->intrs[i].line = irq[0] + offset;
+                if (n > 1)
+                        np->intrs[i].sense = irq[1];
+                if (n > 2) {
+                        printk("hmmm, got %d intr cells for %s:", n,
+                               np->full_name);
+                        for (j = 0; j < n; ++j)
+                                printk(" %d", irq[j]);
+                        printk("\n");
+                }
+                ints += intrcells;
+        }
+
+        return mem_start;
+}
+
+/*
+ * When BootX makes a copy of the device tree from the MacOS
+ * Name Registry, it is in the format we use but all of the pointers
+ * are offsets from the start of the tree.
+ * This procedure updates the pointers.
+ */
+void __init
+relocate_nodes(void)
+{
+        unsigned long base;
+        struct device_node *np;
+        struct property *pp;
+
+#define ADDBASE(x)      (x = (typeof (x))((x)? ((unsigned long)(x) + base): 0))
+
+        base = (unsigned long) boot_infos + boot_infos->deviceTreeOffset;
+        allnodes = (struct device_node *)(base + 4);
+        for (np = allnodes; np != 0; np = np->allnext) {
+                ADDBASE(np->full_name);
+                ADDBASE(np->properties);
+                ADDBASE(np->parent);
+                ADDBASE(np->child);
+                ADDBASE(np->sibling);
+                ADDBASE(np->allnext);
+                for (pp = np->properties; pp != 0; pp = pp->next) {
+                        ADDBASE(pp->name);
+                        ADDBASE(pp->value);
+                        ADDBASE(pp->next);
+                }
+        }
+}
+
+int
+prom_n_addr_cells(struct device_node* np)
+{
+        int* ip;
+        do {
+                if (np->parent)
+                        np = np->parent;
+                ip = (int *) get_property(np, "#address-cells", NULL);
+                if (ip != NULL)
+                        return *ip;
+        } while (np->parent);
+        /* No #address-cells property for the root node, default to 1 */
+        return 1;
+}
+
+int
+prom_n_size_cells(struct device_node* np)
+{
+        int* ip;
+        do {
+                if (np->parent)
+                        np = np->parent;
+                ip = (int *) get_property(np, "#size-cells", NULL);
+                if (ip != NULL)
+                        return *ip;
+        } while (np->parent);
+        /* No #size-cells property for the root node, default to 1 */
+        return 1;
+}
+
+static unsigned long __init
+map_addr(struct device_node *np, unsigned long space, unsigned long addr)
+{
+        int na;
+        unsigned int *ranges;
+        int rlen = 0;
+        unsigned int type;
+
+        type = (space >> 24) & 3;
+        if (type == 0)
+                return addr;
+
+        while ((np = np->parent) != NULL) {
+                if (strcmp(np->type, "pci") != 0)
+                        continue;
+                /* PCI bridge: map the address through the ranges property */
+                na = prom_n_addr_cells(np);
+                ranges = (unsigned int *) get_property(np, "ranges", &rlen);
+                while ((rlen -= (na + 5) * sizeof(unsigned int)) >= 0) {
+                        if (((ranges[0] >> 24) & 3) == type
+                            && ranges[2] <= addr
+                            && addr - ranges[2] < ranges[na+4]) {
+                                /* ok, this matches, translate it */
+                                addr += ranges[na+2] - ranges[2];
+                                break;
+                        }
+                        ranges += na + 5;
+                }
+        }
+        return addr;
+}
+
+static unsigned long __init
+interpret_pci_props(struct device_node *np, unsigned long mem_start,
+                    int naddrc, int nsizec)
+{
+        struct address_range *adr;
+        struct pci_reg_property *pci_addrs;
+        int i, l, *ip;
+
+        pci_addrs = (struct pci_reg_property *)
+                get_property(np, "assigned-addresses", &l);
+        if (pci_addrs != 0 && l >= sizeof(struct pci_reg_property)) {
+                i = 0;
+                adr = (struct address_range *) mem_start;
+                while ((l -= sizeof(struct pci_reg_property)) >= 0) {
+                        adr[i].space = pci_addrs[i].addr.a_hi;
+                        adr[i].address = map_addr(np, pci_addrs[i].addr.a_hi,
+                                                  pci_addrs[i].addr.a_lo);
+                        adr[i].size = pci_addrs[i].size_lo;
+                        ++i;
+                }
+                np->addrs = adr;
+                np->n_addrs = i;
+                mem_start += i * sizeof(struct address_range);
+        }
+
+        if (use_of_interrupt_tree)
+                return mem_start;
+
+        ip = (int *) get_property(np, "AAPL,interrupts", &l);
+        if (ip == 0 && np->parent)
+                ip = (int *) get_property(np->parent, "AAPL,interrupts", &l);
+        if (ip == 0)
+                ip = (int *) get_property(np, "interrupts", &l);
+        if (ip != 0) {
+                np->intrs = (struct interrupt_info *) mem_start;
+                np->n_intrs = l / sizeof(int);
+                mem_start += np->n_intrs * sizeof(struct interrupt_info);
+                for (i = 0; i < np->n_intrs; ++i) {
+                        np->intrs[i].line = *ip++;
+                        np->intrs[i].sense = 1;
+                }
+        }
+
+        return mem_start;
+}
+
+static unsigned long __init
+interpret_dbdma_props(struct device_node *np, unsigned long mem_start,
+                      int naddrc, int nsizec)
+{
+        struct reg_property *rp;
+        struct address_range *adr;
+        unsigned long base_address;
+        int i, l, *ip;
+        struct device_node *db;
+
+        base_address = 0;
+        for (db = np->parent; db != NULL; db = db->parent) {
+                if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) {
+                        base_address = db->addrs[0].address;
+                        break;
+                }
+        }
+
+        rp = (struct reg_property *) get_property(np, "reg", &l);
+        if (rp != 0 && l >= sizeof(struct reg_property)) {
+                i = 0;
+                adr = (struct address_range *) mem_start;
+                while ((l -= sizeof(struct reg_property)) >= 0) {
+                        adr[i].space = 2;
+                        adr[i].address = rp[i].address + base_address;
+                        adr[i].size = rp[i].size;
+                        ++i;
+                }
+                np->addrs = adr;
+                np->n_addrs = i;
+                mem_start += i * sizeof(struct address_range);
+        }
+
+        if (use_of_interrupt_tree)
+                return mem_start;
+
+        ip = (int *) get_property(np, "AAPL,interrupts", &l);
+        if (ip == 0)
+                ip = (int *) get_property(np, "interrupts", &l);
+        if (ip != 0) {
+                np->intrs = (struct interrupt_info *) mem_start;
+                np->n_intrs = l / sizeof(int);
+                mem_start += np->n_intrs * sizeof(struct interrupt_info);
+                for (i = 0; i < np->n_intrs; ++i) {
+                        np->intrs[i].line = *ip++;
+                        np->intrs[i].sense = 1;
+                }
+        }
+
+        return mem_start;
+}
+
+static unsigned long __init
+interpret_macio_props(struct device_node *np, unsigned long mem_start,
+                      int naddrc, int nsizec)
+{
+        struct reg_property *rp;
+        struct address_range *adr;
+        unsigned long base_address;
+        int i, l, *ip;
+        struct device_node *db;
+
+        base_address = 0;
+        for (db = np->parent; db != NULL; db = db->parent) {
+                if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) {
+                        base_address = db->addrs[0].address;
+                        break;
+                }
+        }
+
+        rp = (struct reg_property *) get_property(np, "reg", &l);
+        if (rp != 0 && l >= sizeof(struct reg_property)) {
+                i = 0;
+                adr = (struct address_range *) mem_start;
+                while ((l -= sizeof(struct reg_property)) >= 0) {
+                        adr[i].space = 2;
+                        adr[i].address = rp[i].address + base_address;
+                        adr[i].size = rp[i].size;
+                        ++i;
+                }
+                np->addrs = adr;
+                np->n_addrs = i;
+                mem_start += i * sizeof(struct address_range);
+        }
+
+        if (use_of_interrupt_tree)
+                return mem_start;
+
+        ip = (int *) get_property(np, "interrupts", &l);
+        if (ip == 0)
+                ip = (int *) get_property(np, "AAPL,interrupts", &l);
+        if (ip != 0) {
+                np->intrs = (struct interrupt_info *) mem_start;
+                np->n_intrs = l / sizeof(int);
+                for (i = 0; i < np->n_intrs; ++i) {
+                        np->intrs[i].line = *ip++;
+                        np->intrs[i].sense = 1;
+                }
+                mem_start += np->n_intrs * sizeof(struct interrupt_info);
+        }
+
+        return mem_start;
+}
+
+static unsigned long __init
+interpret_isa_props(struct device_node *np, unsigned long mem_start,
+                    int naddrc, int nsizec)
+{
+        struct isa_reg_property *rp;
+        struct address_range *adr;
+        int i, l, *ip;
+
+        rp = (struct isa_reg_property *) get_property(np, "reg", &l);
+        if (rp != 0 && l >= sizeof(struct isa_reg_property)) {
+                i = 0;
+                adr = (struct address_range *) mem_start;
+                while ((l -= sizeof(struct reg_property)) >= 0) {
+                        adr[i].space = rp[i].space;
+                        adr[i].address = rp[i].address
+                                + (adr[i].space? 0: _ISA_MEM_BASE);
+                        adr[i].size = rp[i].size;
+                        ++i;
+                }
+                np->addrs = adr;
+                np->n_addrs = i;
+                mem_start += i * sizeof(struct address_range);
+        }
+
+        if (use_of_interrupt_tree)
+                return mem_start;
+
+        ip = (int *) get_property(np, "interrupts", &l);
+        if (ip != 0) {
+                np->intrs = (struct interrupt_info *) mem_start;
+                np->n_intrs = l / (2 * sizeof(int));
+                mem_start += np->n_intrs * sizeof(struct interrupt_info);
+                for (i = 0; i < np->n_intrs; ++i) {
+                        np->intrs[i].line = *ip++;
+                        np->intrs[i].sense = *ip++;
+                }
+        }
+
+        return mem_start;
+}
+
+static unsigned long __init
+interpret_root_props(struct device_node *np, unsigned long mem_start,
+                     int naddrc, int nsizec)
+{
+        struct address_range *adr;
+        int i, l, *ip;
+        unsigned int *rp;
+        int rpsize = (naddrc + nsizec) * sizeof(unsigned int);
+
+        rp = (unsigned int *) get_property(np, "reg", &l);
+        if (rp != 0 && l >= rpsize) {
+                i = 0;
+                adr = (struct address_range *) mem_start;
+                while ((l -= rpsize) >= 0) {
+                        adr[i].space = (naddrc >= 2? rp[naddrc-2]: 2);
+                        adr[i].address = rp[naddrc - 1];
+                        adr[i].size = rp[naddrc + nsizec - 1];
+                        ++i;
+                        rp += naddrc + nsizec;
+                }
+                np->addrs = adr;
+                np->n_addrs = i;
+                mem_start += i * sizeof(struct address_range);
+        }
+
+        if (use_of_interrupt_tree)
+                return mem_start;
+
+        ip = (int *) get_property(np, "AAPL,interrupts", &l);
+        if (ip == 0)
+                ip = (int *) get_property(np, "interrupts", &l);
+        if (ip != 0) {
+                np->intrs = (struct interrupt_info *) mem_start;
+                np->n_intrs = l / sizeof(int);
+                mem_start += np->n_intrs * sizeof(struct interrupt_info);
+                for (i = 0; i < np->n_intrs; ++i) {
+                        np->intrs[i].line = *ip++;
+                        np->intrs[i].sense = 1;
+                }
+        }
+
+        return mem_start;
+}
+
+/*
+ * Work out the sense (active-low level / active-high edge)
+ * of each interrupt from the device tree.
+ */
+void __init
+prom_get_irq_senses(unsigned char *senses, int off, int max)
+{
+        struct device_node *np;
+        int i, j;
+
+        /* default to level-triggered */
+        memset(senses, 1, max - off);
+        if (!use_of_interrupt_tree)
+                return;
+
+        for (np = allnodes; np != 0; np = np->allnext) {
+                for (j = 0; j < np->n_intrs; j++) {
+                        i = np->intrs[j].line;
+                        if (i >= off && i < max) {
+                                if (np->intrs[j].sense == 1)
+                                        senses[i-off] = (IRQ_SENSE_LEVEL
+                                                | IRQ_POLARITY_NEGATIVE);
+                                else
+                                        senses[i-off] = (IRQ_SENSE_EDGE
+                                                | IRQ_POLARITY_POSITIVE);
+                        }
+                }
+        }
+}
+
+/*
+ * Construct and return a list of the device_nodes with a given name.
+ */
+struct device_node *
+find_devices(const char *name)
+{
+        struct device_node *head, **prevp, *np;
+
+        prevp = &head;
+        for (np = allnodes; np != 0; np = np->allnext) {
+                if (np->name != 0 && strcasecmp(np->name, name) == 0) {
+                        *prevp = np;
+                        prevp = &np->next;
+                }
+        }
+        *prevp = NULL;
+        return head;
+}
+
+/*
+ * Construct and return a list of the device_nodes with a given type.
+ */
+struct device_node *
+find_type_devices(const char *type)
+{
+        struct device_node *head, **prevp, *np;
+
+        prevp = &head;
+        for (np = allnodes; np != 0; np = np->allnext) {
+                if (np->type != 0 && strcasecmp(np->type, type) == 0) {
+                        *prevp = np;
+                        prevp = &np->next;
+                }
+        }
+        *prevp = NULL;
+        return head;
+}
+
+/*
+ * Returns all nodes linked together
+ */
+struct device_node * __openfirmware
+find_all_nodes(void)
+{
+        struct device_node *head, **prevp, *np;
+
+        prevp = &head;
+        for (np = allnodes; np != 0; np = np->allnext) {
+                *prevp = np;
+                prevp = &np->next;
+        }
+        *prevp = NULL;
+        return head;
+}
+
+/* Checks if the given "compat" string matches one of the strings in
+ * the device's "compatible" property
+ */
+int
+device_is_compatible(struct device_node *device, const char *compat)
+{
+        const char* cp;
+        int cplen, l;
+
+        cp = (char *) get_property(device, "compatible", &cplen);
+        if (cp == NULL)
+                return 0;
+        while (cplen > 0) {
+                if (strncasecmp(cp, compat, strlen(compat)) == 0)
+                        return 1;
+                l = strlen(cp) + 1;
+                cp += l;
+                cplen -= l;
+        }
+
+        return 0;
+}
+
+
+/*
+ * Indicates whether the root node has a given value in its
+ * compatible property.
+ */
+int
+machine_is_compatible(const char *compat)
+{
+        struct device_node *root;
+
+        root = find_path_device("/");
+        if (root == 0)
+                return 0;
+        return device_is_compatible(root, compat);
+}
+
+/*
+ * Construct and return a list of the device_nodes with a given type
+ * and compatible property.
+ */
+struct device_node *
+find_compatible_devices(const char *type, const char *compat)
+{
+        struct device_node *head, **prevp, *np;
+
+        prevp = &head;
+        for (np = allnodes; np != 0; np = np->allnext) {
+                if (type != NULL
+                    && !(np->type != 0 && strcasecmp(np->type, type) == 0))
+                        continue;
+                if (device_is_compatible(np, compat)) {
+                        *prevp = np;
+                        prevp = &np->next;
+                }
+        }
+        *prevp = NULL;
+        return head;
+}
+
+/*
+ * Find the device_node with a given full_name.
+ */
+struct device_node *
+find_path_device(const char *path)
+{
+        struct device_node *np;
+
+        for (np = allnodes; np != 0; np = np->allnext)
+                if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0)
+                        return np;
+        return NULL;
+}
+
+/*******
+ *
+ * New implementation of the OF "find" APIs, return a refcounted
+ * object, call of_node_put() when done. Currently, still lacks
+ * locking as old implementation, this is beeing done for ppc64.
+ *
+ * Note that property management will need some locking as well,
+ * this isn't dealt with yet
+ *
+ *******/
+
+/**
+ *      of_find_node_by_name - Find a node by it's "name" property
+ *      @from:  The node to start searching from or NULL, the node
+ *              you pass will not be searched, only the next one
+ *              will; typically, you pass what the previous call
+ *              returned. of_node_put() will be called on it
+ *      @name:  The name string to match against
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.
+ */
+struct device_node *of_find_node_by_name(struct device_node *from,
+        const char *name)
+{
+        struct device_node *np = from ? from->allnext : allnodes;
+
+        for (; np != 0; np = np->allnext)
+                if (np->name != 0 && strcasecmp(np->name, name) == 0)
+                        break;
+        if (from)
+                of_node_put(from);
+        return of_node_get(np);
+}
+
+/**
+ *      of_find_node_by_type - Find a node by it's "device_type" property
+ *      @from:  The node to start searching from or NULL, the node
+ *              you pass will not be searched, only the next one
+ *              will; typically, you pass what the previous call
+ *              returned. of_node_put() will be called on it
+ *      @name:  The type string to match against
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.
+ */
+struct device_node *of_find_node_by_type(struct device_node *from,
+        const char *type)
+{
+        struct device_node *np = from ? from->allnext : allnodes;
+
+        for (; np != 0; np = np->allnext)
+                if (np->type != 0 && strcasecmp(np->type, type) == 0)
+                        break;
+        if (from)
+                of_node_put(from);
+        return of_node_get(np);
+}
+
+/**
+ *      of_find_compatible_node - Find a node based on type and one of the
+ *                                tokens in it's "compatible" property
+ *      @from:          The node to start searching from or NULL, the node
+ *                      you pass will not be searched, only the next one
+ *                      will; typically, you pass what the previous call
+ *                      returned. of_node_put() will be called on it
+ *      @type:          The type string to match "device_type" or NULL to ignore
+ *      @compatible:    The string to match to one of the tokens in the device
+ *                      "compatible" list.
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.
+ */
+struct device_node *of_find_compatible_node(struct device_node *from,
+        const char *type, const char *compatible)
+{
+        struct device_node *np = from ? from->allnext : allnodes;
+
+        for (; np != 0; np = np->allnext) {
+                if (type != NULL
+                    && !(np->type != 0 && strcasecmp(np->type, type) == 0))
+                        continue;
+                if (device_is_compatible(np, compatible))
+                        break;
+        }
+        if (from)
+                of_node_put(from);
+        return of_node_get(np);
+}
+
+/**
+ *      of_find_node_by_path - Find a node matching a full OF path
+ *      @path:  The full path to match
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.
+ */
+struct device_node *of_find_node_by_path(const char *path)
+{
+        struct device_node *np = allnodes;
+
+        for (; np != 0; np = np->allnext)
+                if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0)
+                        break;
+        return of_node_get(np);
+}
+
+/**
+ *      of_find_all_nodes - Get next node in global list
+ *      @prev:  Previous node or NULL to start iteration
+ *              of_node_put() will be called on it
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.
+ */
+struct device_node *of_find_all_nodes(struct device_node *prev)
+{
+        return of_node_get(prev ? prev->allnext : allnodes);
+}
+
+/**
+ *      of_get_parent - Get a node's parent if any
+ *      @node:  Node to get parent
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.
+ */
+struct device_node *of_get_parent(const struct device_node *node)
+{
+        return node ? of_node_get(node->parent) : NULL;
+}
+
+/**
+ *      of_get_next_child - Iterate a node childs
+ *      @node:  parent node
+ *      @prev:  previous child of the parent node, or NULL to get first
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.
+ */
+struct device_node *of_get_next_child(const struct device_node *node,
+                                      struct device_node *prev)
+{
+        struct device_node *next = prev ? prev->sibling : node->child;
+
+        for (; next != 0; next = next->sibling)
+                if (of_node_get(next))
+                        break;
+        if (prev)
+                of_node_put(prev);
+        return next;
+}
+
+/**
+ *      of_node_get - Increment refcount of a node
+ *      @node:  Node to inc refcount, NULL is supported to
+ *              simplify writing of callers
+ *
+ *      Returns the node itself or NULL if gone. Current implementation
+ *      does nothing as we don't yet do dynamic node allocation on ppc32
+ */
+struct device_node *of_node_get(struct device_node *node)
+{
+        return node;
+}
+
+/**
+ *      of_node_put - Decrement refcount of a node
+ *      @node:  Node to dec refcount, NULL is supported to
+ *              simplify writing of callers
+ *
+ *      Current implementation does nothing as we don't yet do dynamic node
+ *      allocation on ppc32
+ */
+void  of_node_put(struct device_node *node)
+{
+}
+
+/*
+ * Find the device_node with a given phandle.
+ */
+static struct device_node * __init
+find_phandle(phandle ph)
+{
+        struct device_node *np;
+
+        for (np = allnodes; np != 0; np = np->allnext)
+                if (np->node == ph)
+                        return np;
+        return NULL;
+}
+
+/*
+ * Find a property with a given name for a given node
+ * and return the value.
+ */
+unsigned char *
+get_property(struct device_node *np, const char *name, int *lenp)
+{
+        struct property *pp;
+
+        for (pp = np->properties; pp != 0; pp = pp->next)
+                if (pp->name != NULL && strcmp(pp->name, name) == 0) {
+                        if (lenp != 0)
+                                *lenp = pp->length;
+                        return pp->value;
+                }
+        return NULL;
+}
+
+/*
+ * Add a property to a node
+ */
+void __openfirmware
+prom_add_property(struct device_node* np, struct property* prop)
+{
+        struct property **next = &np->properties;
+
+        prop->next = NULL;
+        while (*next)
+                next = &(*next)->next;
+        *next = prop;
+}
+
+/* I quickly hacked that one, check against spec ! */
+static inline unsigned long __openfirmware
+bus_space_to_resource_flags(unsigned int bus_space)
+{
+        u8 space = (bus_space >> 24) & 0xf;
+        if (space == 0)
+                space = 0x02;
+        if (space == 0x02)
+                return IORESOURCE_MEM;
+        else if (space == 0x01)
+                return IORESOURCE_IO;
+        else {
+                printk(KERN_WARNING "prom.c: bus_space_to_resource_flags(), space: %x\n",
+                        bus_space);
+                return 0;
+        }
+}
+
+static struct resource* __openfirmware
+find_parent_pci_resource(struct pci_dev* pdev, struct address_range *range)
+{
+        unsigned long mask;
+        int i;
+
+        /* Check this one */
+        mask = bus_space_to_resource_flags(range->space);
+        for (i=0; i<DEVICE_COUNT_RESOURCE; i++) {
+                if ((pdev->resource[i].flags & mask) == mask &&
+                        pdev->resource[i].start <= range->address &&
+                        pdev->resource[i].end > range->address) {
+                                if ((range->address + range->size - 1) > pdev->resource[i].end) {
+                                        /* Add better message */
+                                        printk(KERN_WARNING "PCI/OF resource overlap !\n");
+                                        return NULL;
+                                }
+                                break;
+                        }
+        }
+        if (i == DEVICE_COUNT_RESOURCE)
+                return NULL;
+        return &pdev->resource[i];
+}
+
+/*
+ * Request an OF device resource. Currently handles child of PCI devices,
+ * or other nodes attached to the root node. Ultimately, put some
+ * link to resources in the OF node.
+ */
+struct resource* __openfirmware
+request_OF_resource(struct device_node* node, int index, const char* name_postfix)
+{
+        struct pci_dev* pcidev;
+        u8 pci_bus, pci_devfn;
+        unsigned long iomask;
+        struct device_node* nd;
+        struct resource* parent;
+        struct resource *res = NULL;
+        int nlen, plen;
+
+        if (index >= node->n_addrs)
+                goto fail;
+
+        /* Sanity check on bus space */
+        iomask = bus_space_to_resource_flags(node->addrs[index].space);
+        if (iomask & IORESOURCE_MEM)
+                parent = &iomem_resource;
+        else if (iomask & IORESOURCE_IO)
+                parent = &ioport_resource;
+        else
+                goto fail;
+
+        /* Find a PCI parent if any */
+        nd = node;
+        pcidev = NULL;
+        while(nd) {
+                if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn))
+                        pcidev = pci_find_slot(pci_bus, pci_devfn);
+                if (pcidev) break;
+                nd = nd->parent;
+        }
+        if (pcidev)
+                parent = find_parent_pci_resource(pcidev, &node->addrs[index]);
+        if (!parent) {
+                printk(KERN_WARNING "request_OF_resource(%s), parent not found\n",
+                        node->name);
+                goto fail;
+        }
+
+        res = __request_region(parent, node->addrs[index].address, node->addrs[index].size, NULL);
+        if (!res)
+                goto fail;
+        nlen = strlen(node->name);
+        plen = name_postfix ? strlen(name_postfix) : 0;
+        res->name = (const char *)kmalloc(nlen+plen+1, GFP_KERNEL);
+        if (res->name) {
+                strcpy((char *)res->name, node->name);
+                if (plen)
+                        strcpy((char *)res->name+nlen, name_postfix);
+        }
+        return res;
+fail:
+        return NULL;
+}
+
+int __openfirmware
+release_OF_resource(struct device_node* node, int index)
+{
+        struct pci_dev* pcidev;
+        u8 pci_bus, pci_devfn;
+        unsigned long iomask, start, end;
+        struct device_node* nd;
+        struct resource* parent;
+        struct resource *res = NULL;
+
+        if (index >= node->n_addrs)
+                return -EINVAL;
+
+        /* Sanity check on bus space */
+        iomask = bus_space_to_resource_flags(node->addrs[index].space);
+        if (iomask & IORESOURCE_MEM)
+                parent = &iomem_resource;
+        else if (iomask & IORESOURCE_IO)
+                parent = &ioport_resource;
+        else
+                return -EINVAL;
+
+        /* Find a PCI parent if any */
+        nd = node;
+        pcidev = NULL;
+        while(nd) {
+                if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn))
+                        pcidev = pci_find_slot(pci_bus, pci_devfn);
+                if (pcidev) break;
+                nd = nd->parent;
+        }
+        if (pcidev)
+                parent = find_parent_pci_resource(pcidev, &node->addrs[index]);
+        if (!parent) {
+                printk(KERN_WARNING "release_OF_resource(%s), parent not found\n",
+                        node->name);
+                return -ENODEV;
+        }
+
+        /* Find us in the parent and its childs */
+        res = parent->child;
+        start = node->addrs[index].address;
+        end = start + node->addrs[index].size - 1;
+        while (res) {
+                if (res->start == start && res->end == end &&
+                    (res->flags & IORESOURCE_BUSY))
+                        break;
+                if (res->start <= start && res->end >= end)
+                        res = res->child;
+                else
+                        res = res->sibling;
+        }
+        if (!res)
+                return -ENODEV;
+
+        if (res->name) {
+                kfree(res->name);
+                res->name = NULL;
+        }
+        release_resource(res);
+        kfree(res);
+
+        return 0;
+}
+
+#if 0
+void __openfirmware
+print_properties(struct device_node *np)
+{
+        struct property *pp;
+        char *cp;
+        int i, n;
+
+        for (pp = np->properties; pp != 0; pp = pp->next) {
+                printk(KERN_INFO "%s", pp->name);
+                for (i = strlen(pp->name); i < 16; ++i)
+                        printk(" ");
+                cp = (char *) pp->value;
+                for (i = pp->length; i > 0; --i, ++cp)
+                        if ((i > 1 && (*cp < 0x20 || *cp > 0x7e))
+                            || (i == 1 && *cp != 0))
+                                break;
+                if (i == 0 && pp->length > 1) {
+                        /* looks like a string */
+                        printk(" %s\n", (char *) pp->value);
+                } else {
+                        /* dump it in hex */
+                        n = pp->length;
+                        if (n > 64)
+                                n = 64;
+                        if (pp->length % 4 == 0) {
+                                unsigned int *p = (unsigned int *) pp->value;
+
+                                n /= 4;
+                                for (i = 0; i < n; ++i) {
+                                        if (i != 0 && (i % 4) == 0)
+                                                printk("\n                ");
+                                        printk(" %08x", *p++);
+                                }
+                        } else {
+                                unsigned char *bp = pp->value;
+
+                                for (i = 0; i < n; ++i) {
+                                        if (i != 0 && (i % 16) == 0)
+                                                printk("\n                ");
+                                        printk(" %02x", *bp++);
+                                }
+                        }
+                        printk("\n");
+                        if (pp->length > 64)
+                                printk("                 ... (length = %d)\n",
+                                       pp->length);
+                }
+        }
+}
+#endif
+
+static DEFINE_SPINLOCK(rtas_lock);
+
+/* this can be called after setup -- Cort */
+int __openfirmware
+call_rtas(const char *service, int nargs, int nret,
+          unsigned long *outputs, ...)
+{
+        va_list list;
+        int i;
+        unsigned long s;
+        struct device_node *rtas;
+        int *tokp;
+        union {
+                unsigned long words[16];
+                double align;
+        } u;
+
+        rtas = find_devices("rtas");
+        if (rtas == NULL)
+                return -1;
+        tokp = (int *) get_property(rtas, service, NULL);
+        if (tokp == NULL) {
+                printk(KERN_ERR "No RTAS service called %s\n", service);
+                return -1;
+        }
+        u.words[0] = *tokp;
+        u.words[1] = nargs;
+        u.words[2] = nret;
+        va_start(list, outputs);
+        for (i = 0; i < nargs; ++i)
+                u.words[i+3] = va_arg(list, unsigned long);
+        va_end(list);
+
+        /*
+         * RTAS doesn't use floating point.
+         * Or at least, according to the CHRP spec we enter RTAS
+         * with FP disabled, and it doesn't change the FP registers.
+         *  -- paulus.
+         */
+        spin_lock_irqsave(&rtas_lock, s);
+        enter_rtas((void *)__pa(&u));
+        spin_unlock_irqrestore(&rtas_lock, s);
+
+        if (nret > 1 && outputs != NULL)
+                for (i = 0; i < nret-1; ++i)
+                        outputs[i] = u.words[i+nargs+4];
+        return u.words[nargs+3];
+}