1 files changed, 1146 insertions, 0 deletions

diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
new file mode 100644
index 000000000000..34c48718061a
--- /dev/null
+++ b/arch/microblaze/kernel/prom.c
@@ -0,0 +1,1146 @@
+/*
+ * Procedures for creating, accessing and interpreting the device tree.
+ *
+ * Paul Mackerras       August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ *    {engebret|bergner}@us.ibm.com
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <stdarg.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/threads.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/stringify.h>
+#include <linux/delay.h>
+#include <linux/initrd.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/kexec.h>
+#include <linux/debugfs.h>
+#include <linux/irq.h>
+#include <linux/lmb.h>
+
+#include <asm/prom.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+#include <linux/io.h>
+#include <asm/system.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <asm/pci-bridge.h>
+
+static int __initdata dt_root_addr_cells;
+static int __initdata dt_root_size_cells;
+
+typedef u32 cell_t;
+
+static struct boot_param_header *initial_boot_params;
+
+/* export that to outside world */
+struct device_node *of_chosen;
+
+static inline char *find_flat_dt_string(u32 offset)
+{
+        return ((char *)initial_boot_params) +
+                initial_boot_params->off_dt_strings + offset;
+}
+
+/**
+ * This function is used to scan the flattened device-tree, it is
+ * used to extract the memory informations at boot before we can
+ * unflatten the tree
+ */
+int __init of_scan_flat_dt(int (*it)(unsigned long node,
+                                     const char *uname, int depth,
+                                     void *data),
+                           void *data)
+{
+        unsigned long p = ((unsigned long)initial_boot_params) +
+                initial_boot_params->off_dt_struct;
+        int rc = 0;
+        int depth = -1;
+
+        do {
+                u32 tag = *((u32 *)p);
+                char *pathp;
+
+                p += 4;
+                if (tag == OF_DT_END_NODE) {
+                        depth--;
+                        continue;
+                }
+                if (tag == OF_DT_NOP)
+                        continue;
+                if (tag == OF_DT_END)
+                        break;
+                if (tag == OF_DT_PROP) {
+                        u32 sz = *((u32 *)p);
+                        p += 8;
+                        if (initial_boot_params->version < 0x10)
+                                p = _ALIGN(p, sz >= 8 ? 8 : 4);
+                        p += sz;
+                        p = _ALIGN(p, 4);
+                        continue;
+                }
+                if (tag != OF_DT_BEGIN_NODE) {
+                        printk(KERN_WARNING "Invalid tag %x scanning flattened"
+                                " device tree !\n", tag);
+                        return -EINVAL;
+                }
+                depth++;
+                pathp = (char *)p;
+                p = _ALIGN(p + strlen(pathp) + 1, 4);
+                if ((*pathp) == '/') {
+                        char *lp, *np;
+                        for (lp = NULL, np = pathp; *np; np++)
+                                if ((*np) == '/')
+                                        lp = np+1;
+                        if (lp != NULL)
+                                pathp = lp;
+                }
+                rc = it(p, pathp, depth, data);
+                if (rc != 0)
+                        break;
+        } while (1);
+
+        return rc;
+}
+
+unsigned long __init of_get_flat_dt_root(void)
+{
+        unsigned long p = ((unsigned long)initial_boot_params) +
+                initial_boot_params->off_dt_struct;
+
+        while (*((u32 *)p) == OF_DT_NOP)
+                p += 4;
+        BUG_ON(*((u32 *)p) != OF_DT_BEGIN_NODE);
+        p += 4;
+        return _ALIGN(p + strlen((char *)p) + 1, 4);
+}
+
+/**
+ * This function can be used within scan_flattened_dt callback to get
+ * access to properties
+ */
+void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
+                                unsigned long *size)
+{
+        unsigned long p = node;
+
+        do {
+                u32 tag = *((u32 *)p);
+                u32 sz, noff;
+                const char *nstr;
+
+                p += 4;
+                if (tag == OF_DT_NOP)
+                        continue;
+                if (tag != OF_DT_PROP)
+                        return NULL;
+
+                sz = *((u32 *)p);
+                noff = *((u32 *)(p + 4));
+                p += 8;
+                if (initial_boot_params->version < 0x10)
+                        p = _ALIGN(p, sz >= 8 ? 8 : 4);
+
+                nstr = find_flat_dt_string(noff);
+                if (nstr == NULL) {
+                        printk(KERN_WARNING "Can't find property index"
+                                " name !\n");
+                        return NULL;
+                }
+                if (strcmp(name, nstr) == 0) {
+                        if (size)
+                                *size = sz;
+                        return (void *)p;
+                }
+                p += sz;
+                p = _ALIGN(p, 4);
+        } while (1);
+}
+
+int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
+{
+        const char *cp;
+        unsigned long cplen, l;
+
+        cp = of_get_flat_dt_prop(node, "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;
+}
+
+static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
+                                        unsigned long align)
+{
+        void *res;
+
+        *mem = _ALIGN(*mem, align);
+        res = (void *)*mem;
+        *mem += size;
+
+        return res;
+}
+
+static unsigned long __init unflatten_dt_node(unsigned long mem,
+                                        unsigned long *p,
+                                        struct device_node *dad,
+                                        struct device_node ***allnextpp,
+                                        unsigned long fpsize)
+{
+        struct device_node *np;
+        struct property *pp, **prev_pp = NULL;
+        char *pathp;
+        u32 tag;
+        unsigned int l, allocl;
+        int has_name = 0;
+        int new_format = 0;
+
+        tag = *((u32 *)(*p));
+        if (tag != OF_DT_BEGIN_NODE) {
+                printk("Weird tag at start of node: %x\n", tag);
+                return mem;
+        }
+        *p += 4;
+        pathp = (char *)*p;
+        l = allocl = strlen(pathp) + 1;
+        *p = _ALIGN(*p + l, 4);
+
+        /* version 0x10 has a more compact unit name here instead of the full
+         * path. we accumulate the full path size using "fpsize", we'll rebuild
+         * it later. We detect this because the first character of the name is
+         * not '/'.
+         */
+        if ((*pathp) != '/') {
+                new_format = 1;
+                if (fpsize == 0) {
+                        /* root node: special case. fpsize accounts for path
+                         * plus terminating zero. root node only has '/', so
+                         * fpsize should be 2, but we want to avoid the first
+                         * level nodes to have two '/' so we use fpsize 1 here
+                         */
+                        fpsize = 1;
+                        allocl = 2;
+                } else {
+                        /* account for '/' and path size minus terminal 0
+                         * already in 'l'
+                         */
+                        fpsize += l;
+                        allocl = fpsize;
+                }
+        }
+
+        np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
+                                __alignof__(struct device_node));
+        if (allnextpp) {
+                memset(np, 0, sizeof(*np));
+                np->full_name = ((char *)np) + sizeof(struct device_node);
+                if (new_format) {
+                        char *p2 = np->full_name;
+                        /* rebuild full path for new format */
+                        if (dad && dad->parent) {
+                                strcpy(p2, dad->full_name);
+#ifdef DEBUG
+                                if ((strlen(p2) + l + 1) != allocl) {
+                                        pr_debug("%s: p: %d, l: %d, a: %d\n",
+                                                pathp, (int)strlen(p2),
+                                                l, allocl);
+                                }
+#endif
+                                p2 += strlen(p2);
+                        }
+                        *(p2++) = '/';
+                        memcpy(p2, pathp, l);
+                } else
+                        memcpy(np->full_name, pathp, l);
+                prev_pp = &np->properties;
+                **allnextpp = np;
+                *allnextpp = &np->allnext;
+                if (dad != NULL) {
+                        np->parent = dad;
+                        /* we temporarily use the next field as `last_child'*/
+                        if (dad->next == NULL)
+                                dad->child = np;
+                        else
+                                dad->next->sibling = np;
+                        dad->next = np;
+                }
+                kref_init(&np->kref);
+        }
+        while (1) {
+                u32 sz, noff;
+                char *pname;
+
+                tag = *((u32 *)(*p));
+                if (tag == OF_DT_NOP) {
+                        *p += 4;
+                        continue;
+                }
+                if (tag != OF_DT_PROP)
+                        break;
+                *p += 4;
+                sz = *((u32 *)(*p));
+                noff = *((u32 *)((*p) + 4));
+                *p += 8;
+                if (initial_boot_params->version < 0x10)
+                        *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
+
+                pname = find_flat_dt_string(noff);
+                if (pname == NULL) {
+                        printk(KERN_INFO
+                                "Can't find property name in list !\n");
+                        break;
+                }
+                if (strcmp(pname, "name") == 0)
+                        has_name = 1;
+                l = strlen(pname) + 1;
+                pp = unflatten_dt_alloc(&mem, sizeof(struct property),
+                                        __alignof__(struct property));
+                if (allnextpp) {
+                        if (strcmp(pname, "linux,phandle") == 0) {
+                                np->node = *((u32 *)*p);
+                                if (np->linux_phandle == 0)
+                                        np->linux_phandle = np->node;
+                        }
+                        if (strcmp(pname, "ibm,phandle") == 0)
+                                np->linux_phandle = *((u32 *)*p);
+                        pp->name = pname;
+                        pp->length = sz;
+                        pp->value = (void *)*p;
+                        *prev_pp = pp;
+                        prev_pp = &pp->next;
+                }
+                *p = _ALIGN((*p) + sz, 4);
+        }
+        /* with version 0x10 we may not have the name property, recreate
+         * it here from the unit name if absent
+         */
+        if (!has_name) {
+                char *p1 = pathp, *ps = pathp, *pa = NULL;
+                int sz;
+
+                while (*p1) {
+                        if ((*p1) == '@')
+                                pa = p1;
+                        if ((*p1) == '/')
+                                ps = p1 + 1;
+                        p1++;
+                }
+                if (pa < ps)
+                        pa = p1;
+                sz = (pa - ps) + 1;
+                pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
+                                        __alignof__(struct property));
+                if (allnextpp) {
+                        pp->name = "name";
+                        pp->length = sz;
+                        pp->value = pp + 1;
+                        *prev_pp = pp;
+                        prev_pp = &pp->next;
+                        memcpy(pp->value, ps, sz - 1);
+                        ((char *)pp->value)[sz - 1] = 0;
+                        pr_debug("fixed up name for %s -> %s\n", pathp,
+                                (char *)pp->value);
+                }
+        }
+        if (allnextpp) {
+                *prev_pp = NULL;
+                np->name = of_get_property(np, "name", NULL);
+                np->type = of_get_property(np, "device_type", NULL);
+
+                if (!np->name)
+                        np->name = "<NULL>";
+                if (!np->type)
+                        np->type = "<NULL>";
+        }
+        while (tag == OF_DT_BEGIN_NODE) {
+                mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
+                tag = *((u32 *)(*p));
+        }
+        if (tag != OF_DT_END_NODE) {
+                printk(KERN_INFO "Weird tag at end of node: %x\n", tag);
+                return mem;
+        }
+        *p += 4;
+        return mem;
+}
+
+/**
+ * unflattens the device-tree passed by the firmware, creating the
+ * tree of struct device_node. It also fills the "name" and "type"
+ * pointers of the nodes so the normal device-tree walking functions
+ * can be used (this used to be done by finish_device_tree)
+ */
+void __init unflatten_device_tree(void)
+{
+        unsigned long start, mem, size;
+        struct device_node **allnextp = &allnodes;
+
+        pr_debug(" -> unflatten_device_tree()\n");
+
+        /* First pass, scan for size */
+        start = ((unsigned long)initial_boot_params) +
+                initial_boot_params->off_dt_struct;
+        size = unflatten_dt_node(0, &start, NULL, NULL, 0);
+        size = (size | 3) + 1;
+
+        pr_debug("  size is %lx, allocating...\n", size);
+
+        /* Allocate memory for the expanded device tree */
+        mem = lmb_alloc(size + 4, __alignof__(struct device_node));
+        mem = (unsigned long) __va(mem);
+
+        ((u32 *)mem)[size / 4] = 0xdeadbeef;
+
+        pr_debug("  unflattening %lx...\n", mem);
+
+        /* Second pass, do actual unflattening */
+        start = ((unsigned long)initial_boot_params) +
+                initial_boot_params->off_dt_struct;
+        unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
+        if (*((u32 *)start) != OF_DT_END)
+                printk(KERN_WARNING "Weird tag at end of tree: %08x\n",
+                        *((u32 *)start));
+        if (((u32 *)mem)[size / 4] != 0xdeadbeef)
+                printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
+                        ((u32 *)mem)[size / 4]);
+        *allnextp = NULL;
+
+        /* Get pointer to OF "/chosen" node for use everywhere */
+        of_chosen = of_find_node_by_path("/chosen");
+        if (of_chosen == NULL)
+                of_chosen = of_find_node_by_path("/chosen@0");
+
+        pr_debug(" <- unflatten_device_tree()\n");
+}
+
+#define early_init_dt_scan_drconf_memory(node) 0
+
+static int __init early_init_dt_scan_cpus(unsigned long node,
+                                          const char *uname, int depth,
+                                          void *data)
+{
+        static int logical_cpuid;
+        char *type = of_get_flat_dt_prop(node, "device_type", NULL);
+        const u32 *intserv;
+        int i, nthreads;
+        int found = 0;
+
+        /* We are scanning "cpu" nodes only */
+        if (type == NULL || strcmp(type, "cpu") != 0)
+                return 0;
+
+        /* Get physical cpuid */
+        intserv = of_get_flat_dt_prop(node, "reg", NULL);
+        nthreads = 1;
+
+        /*
+         * Now see if any of these threads match our boot cpu.
+         * NOTE: This must match the parsing done in smp_setup_cpu_maps.
+         */
+        for (i = 0; i < nthreads; i++) {
+                /*
+                 * version 2 of the kexec param format adds the phys cpuid of
+                 * booted proc.
+                 */
+                if (initial_boot_params && initial_boot_params->version >= 2) {
+                        if (intserv[i] ==
+                                        initial_boot_params->boot_cpuid_phys) {
+                                found = 1;
+                                break;
+                        }
+                } else {
+                        /*
+                         * Check if it's the boot-cpu, set it's hw index now,
+                         * unfortunately this format did not support booting
+                         * off secondary threads.
+                         */
+                        if (of_get_flat_dt_prop(node,
+                                        "linux,boot-cpu", NULL) != NULL) {
+                                found = 1;
+                                break;
+                        }
+                }
+
+#ifdef CONFIG_SMP
+                /* logical cpu id is always 0 on UP kernels */
+                logical_cpuid++;
+#endif
+        }
+
+        if (found) {
+                pr_debug("boot cpu: logical %d physical %d\n", logical_cpuid,
+                        intserv[i]);
+                boot_cpuid = logical_cpuid;
+        }
+
+        return 0;
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+static void __init early_init_dt_check_for_initrd(unsigned long node)
+{
+        unsigned long l;
+        u32 *prop;
+
+        pr_debug("Looking for initrd properties... ");
+
+        prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
+        if (prop) {
+                initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
+
+                prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
+                if (prop) {
+                        initrd_end = (unsigned long)
+                                        __va(of_read_ulong(prop, l/4));
+                        initrd_below_start_ok = 1;
+                } else {
+                        initrd_start = 0;
+                }
+        }
+
+        pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n",
+                                        initrd_start, initrd_end);
+}
+#else
+static inline void early_init_dt_check_for_initrd(unsigned long node)
+{
+}
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+static int __init early_init_dt_scan_chosen(unsigned long node,
+                                const char *uname, int depth, void *data)
+{
+        unsigned long l;
+        char *p;
+
+        pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
+
+        if (depth != 1 ||
+                (strcmp(uname, "chosen") != 0 &&
+                                strcmp(uname, "chosen@0") != 0))
+                return 0;
+
+#ifdef CONFIG_KEXEC
+        lprop = (u64 *)of_get_flat_dt_prop(node,
+                                "linux,crashkernel-base", NULL);
+        if (lprop)
+                crashk_res.start = *lprop;
+
+        lprop = (u64 *)of_get_flat_dt_prop(node,
+                                "linux,crashkernel-size", NULL);
+        if (lprop)
+                crashk_res.end = crashk_res.start + *lprop - 1;
+#endif
+
+        early_init_dt_check_for_initrd(node);
+
+        /* Retreive command line */
+        p = of_get_flat_dt_prop(node, "bootargs", &l);
+        if (p != NULL && l > 0)
+                strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
+
+#ifdef CONFIG_CMDLINE
+        if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
+                strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#endif /* CONFIG_CMDLINE */
+
+        pr_debug("Command line is: %s\n", cmd_line);
+
+        /* break now */
+        return 1;
+}
+
+static int __init early_init_dt_scan_root(unsigned long node,
+                                const char *uname, int depth, void *data)
+{
+        u32 *prop;
+
+        if (depth != 0)
+                return 0;
+
+        prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
+        dt_root_size_cells = (prop == NULL) ? 1 : *prop;
+        pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
+
+        prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
+        dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
+        pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
+
+        /* break now */
+        return 1;
+}
+
+static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
+{
+        cell_t *p = *cellp;
+
+        *cellp = p + s;
+        return of_read_number(p, s);
+}
+
+static int __init early_init_dt_scan_memory(unsigned long node,
+                                const char *uname, int depth, void *data)
+{
+        char *type = of_get_flat_dt_prop(node, "device_type", NULL);
+        cell_t *reg, *endp;
+        unsigned long l;
+
+        /* Look for the ibm,dynamic-reconfiguration-memory node */
+/*      if (depth == 1 &&
+                strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
+                return early_init_dt_scan_drconf_memory(node);
+*/
+        /* We are scanning "memory" nodes only */
+        if (type == NULL) {
+                /*
+                 * The longtrail doesn't have a device_type on the
+                 * /memory node, so look for the node called /memory@0.
+                 */
+                if (depth != 1 || strcmp(uname, "memory@0") != 0)
+                        return 0;
+        } else if (strcmp(type, "memory") != 0)
+                return 0;
+
+        reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
+        if (reg == NULL)
+                reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
+        if (reg == NULL)
+                return 0;
+
+        endp = reg + (l / sizeof(cell_t));
+
+        pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
+                uname, l, reg[0], reg[1], reg[2], reg[3]);
+
+        while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
+                u64 base, size;
+
+                base = dt_mem_next_cell(dt_root_addr_cells, &reg);
+                size = dt_mem_next_cell(dt_root_size_cells, &reg);
+
+                if (size == 0)
+                        continue;
+                pr_debug(" - %llx ,  %llx\n", (unsigned long long)base,
+                        (unsigned long long)size);
+
+                lmb_add(base, size);
+        }
+        return 0;
+}
+
+#ifdef CONFIG_PHYP_DUMP
+/**
+ * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
+ *
+ * Function to find the largest size we need to reserve
+ * during early boot process.
+ *
+ * It either looks for boot param and returns that OR
+ * returns larger of 256 or 5% rounded down to multiples of 256MB.
+ *
+ */
+static inline unsigned long phyp_dump_calculate_reserve_size(void)
+{
+        unsigned long tmp;
+
+        if (phyp_dump_info->reserve_bootvar)
+                return phyp_dump_info->reserve_bootvar;
+
+        /* divide by 20 to get 5% of value */
+        tmp = lmb_end_of_DRAM();
+        do_div(tmp, 20);
+
+        /* round it down in multiples of 256 */
+        tmp = tmp & ~0x0FFFFFFFUL;
+
+        return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
+}
+
+/**
+ * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
+ *
+ * This routine may reserve memory regions in the kernel only
+ * if the system is supported and a dump was taken in last
+ * boot instance or if the hardware is supported and the
+ * scratch area needs to be setup. In other instances it returns
+ * without reserving anything. The memory in case of dump being
+ * active is freed when the dump is collected (by userland tools).
+ */
+static void __init phyp_dump_reserve_mem(void)
+{
+        unsigned long base, size;
+        unsigned long variable_reserve_size;
+
+        if (!phyp_dump_info->phyp_dump_configured) {
+                printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
+                return;
+        }
+
+        if (!phyp_dump_info->phyp_dump_at_boot) {
+                printk(KERN_INFO "Phyp-dump disabled at boot time\n");
+                return;
+        }
+
+        variable_reserve_size = phyp_dump_calculate_reserve_size();
+
+        if (phyp_dump_info->phyp_dump_is_active) {
+                /* Reserve *everything* above RMR.Area freed by userland tools*/
+                base = variable_reserve_size;
+                size = lmb_end_of_DRAM() - base;
+
+                /* XXX crashed_ram_end is wrong, since it may be beyond
+                 * the memory_limit, it will need to be adjusted. */
+                lmb_reserve(base, size);
+
+                phyp_dump_info->init_reserve_start = base;
+                phyp_dump_info->init_reserve_size = size;
+        } else {
+                size = phyp_dump_info->cpu_state_size +
+                        phyp_dump_info->hpte_region_size +
+                        variable_reserve_size;
+                base = lmb_end_of_DRAM() - size;
+                lmb_reserve(base, size);
+                phyp_dump_info->init_reserve_start = base;
+                phyp_dump_info->init_reserve_size = size;
+        }
+}
+#else
+static inline void __init phyp_dump_reserve_mem(void) {}
+#endif /* CONFIG_PHYP_DUMP  && CONFIG_PPC_RTAS */
+
+#ifdef CONFIG_EARLY_PRINTK
+/* MS this is Microblaze specifig function */
+static int __init early_init_dt_scan_serial(unsigned long node,
+                                const char *uname, int depth, void *data)
+{
+        unsigned long l;
+        char *p;
+        int *addr;
+
+        pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
+
+/* find all serial nodes */
+        if (strncmp(uname, "serial", 6) != 0)
+                return 0;
+
+        early_init_dt_check_for_initrd(node);
+
+/* find compatible node with uartlite */
+        p = of_get_flat_dt_prop(node, "compatible", &l);
+        if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
+                        (strncmp(p, "xlnx,opb-uartlite", 17) != 0))
+                return 0;
+
+        addr = of_get_flat_dt_prop(node, "reg", &l);
+        return *addr; /* return address */
+}
+
+/* this function is looking for early uartlite console - Microblaze specific */
+int __init early_uartlite_console(void)
+{
+        return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
+}
+#endif
+
+void __init early_init_devtree(void *params)
+{
+        pr_debug(" -> early_init_devtree(%p)\n", params);
+
+        /* Setup flat device-tree pointer */
+        initial_boot_params = params;
+
+#ifdef CONFIG_PHYP_DUMP
+        /* scan tree to see if dump occured during last boot */
+        of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
+#endif
+
+        /* Retrieve various informations from the /chosen node of the
+         * device-tree, including the platform type, initrd location and
+         * size, TCE reserve, and more ...
+         */
+        of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
+
+        /* Scan memory nodes and rebuild LMBs */
+        lmb_init();
+        of_scan_flat_dt(early_init_dt_scan_root, NULL);
+        of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+
+        /* Save command line for /proc/cmdline and then parse parameters */
+        strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
+        parse_early_param();
+
+        lmb_analyze();
+
+        pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size());
+
+        pr_debug("Scanning CPUs ...\n");
+
+        /* Retreive CPU related informations from the flat tree
+         * (altivec support, boot CPU ID, ...)
+         */
+        of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
+
+        pr_debug(" <- early_init_devtree()\n");
+}
+
+/**
+ * Indicates whether the root node has a given value in its
+ * compatible property.
+ */
+int machine_is_compatible(const char *compat)
+{
+        struct device_node *root;
+        int rc = 0;
+
+        root = of_find_node_by_path("/");
+        if (root) {
+                rc = of_device_is_compatible(root, compat);
+                of_node_put(root);
+        }
+        return rc;
+}
+EXPORT_SYMBOL(machine_is_compatible);
+
+/*******
+ *
+ * New implementation of the OF "find" APIs, return a refcounted
+ * object, call of_node_put() when done.  The device tree and list
+ * are protected by a rw_lock.
+ *
+ * Note that property management will need some locking as well,
+ * this isn't dealt with yet.
+ *
+ *******/
+
+/**
+ *      of_find_node_by_phandle - Find a node given a phandle
+ *      @handle:        phandle of the node to find
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.
+ */
+struct device_node *of_find_node_by_phandle(phandle handle)
+{
+        struct device_node *np;
+
+        read_lock(&devtree_lock);
+        for (np = allnodes; np != NULL; np = np->allnext)
+                if (np->linux_phandle == handle)
+                        break;
+        of_node_get(np);
+        read_unlock(&devtree_lock);
+        return np;
+}
+EXPORT_SYMBOL(of_find_node_by_phandle);
+
+/**
+ *      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)
+{
+        struct device_node *np;
+
+        read_lock(&devtree_lock);
+        np = prev ? prev->allnext : allnodes;
+        for (; np != NULL; np = np->allnext)
+                if (of_node_get(np))
+                        break;
+        of_node_put(prev);
+        read_unlock(&devtree_lock);
+        return np;
+}
+EXPORT_SYMBOL(of_find_all_nodes);
+
+/**
+ *      of_node_get - Increment refcount of a node
+ *      @node:  Node to inc refcount, NULL is supported to
+ *              simplify writing of callers
+ *
+ *      Returns node.
+ */
+struct device_node *of_node_get(struct device_node *node)
+{
+        if (node)
+                kref_get(&node->kref);
+        return node;
+}
+EXPORT_SYMBOL(of_node_get);
+
+static inline struct device_node *kref_to_device_node(struct kref *kref)
+{
+        return container_of(kref, struct device_node, kref);
+}
+
+/**
+ *      of_node_release - release a dynamically allocated node
+ *      @kref:  kref element of the node to be released
+ *
+ *      In of_node_put() this function is passed to kref_put()
+ *      as the destructor.
+ */
+static void of_node_release(struct kref *kref)
+{
+        struct device_node *node = kref_to_device_node(kref);
+        struct property *prop = node->properties;
+
+        /* We should never be releasing nodes that haven't been detached. */
+        if (!of_node_check_flag(node, OF_DETACHED)) {
+                printk(KERN_INFO "WARNING: Bad of_node_put() on %s\n",
+                        node->full_name);
+                dump_stack();
+                kref_init(&node->kref);
+                return;
+        }
+
+        if (!of_node_check_flag(node, OF_DYNAMIC))
+                return;
+
+        while (prop) {
+                struct property *next = prop->next;
+                kfree(prop->name);
+                kfree(prop->value);
+                kfree(prop);
+                prop = next;
+
+                if (!prop) {
+                        prop = node->deadprops;
+                        node->deadprops = NULL;
+                }
+        }
+        kfree(node->full_name);
+        kfree(node->data);
+        kfree(node);
+}
+
+/**
+ *      of_node_put - Decrement refcount of a node
+ *      @node:  Node to dec refcount, NULL is supported to
+ *              simplify writing of callers
+ *
+ */
+void of_node_put(struct device_node *node)
+{
+        if (node)
+                kref_put(&node->kref, of_node_release);
+}
+EXPORT_SYMBOL(of_node_put);
+
+/*
+ * Plug a device node into the tree and global list.
+ */
+void of_attach_node(struct device_node *np)
+{
+        unsigned long flags;
+
+        write_lock_irqsave(&devtree_lock, flags);
+        np->sibling = np->parent->child;
+        np->allnext = allnodes;
+        np->parent->child = np;
+        allnodes = np;
+        write_unlock_irqrestore(&devtree_lock, flags);
+}
+
+/*
+ * "Unplug" a node from the device tree.  The caller must hold
+ * a reference to the node.  The memory associated with the node
+ * is not freed until its refcount goes to zero.
+ */
+void of_detach_node(struct device_node *np)
+{
+        struct device_node *parent;
+        unsigned long flags;
+
+        write_lock_irqsave(&devtree_lock, flags);
+
+        parent = np->parent;
+        if (!parent)
+                goto out_unlock;
+
+        if (allnodes == np)
+                allnodes = np->allnext;
+        else {
+                struct device_node *prev;
+                for (prev = allnodes;
+                     prev->allnext != np;
+                     prev = prev->allnext)
+                        ;
+                prev->allnext = np->allnext;
+        }
+
+        if (parent->child == np)
+                parent->child = np->sibling;
+        else {
+                struct device_node *prevsib;
+                for (prevsib = np->parent->child;
+                     prevsib->sibling != np;
+                     prevsib = prevsib->sibling)
+                        ;
+                prevsib->sibling = np->sibling;
+        }
+
+        of_node_set_flag(np, OF_DETACHED);
+
+out_unlock:
+        write_unlock_irqrestore(&devtree_lock, flags);
+}
+
+/*
+ * Add a property to a node
+ */
+int prom_add_property(struct device_node *np, struct property *prop)
+{
+        struct property **next;
+        unsigned long flags;
+
+        prop->next = NULL;
+        write_lock_irqsave(&devtree_lock, flags);
+        next = &np->properties;
+        while (*next) {
+                if (strcmp(prop->name, (*next)->name) == 0) {
+                        /* duplicate ! don't insert it */
+                        write_unlock_irqrestore(&devtree_lock, flags);
+                        return -1;
+                }
+                next = &(*next)->next;
+        }
+        *next = prop;
+        write_unlock_irqrestore(&devtree_lock, flags);
+
+#ifdef CONFIG_PROC_DEVICETREE
+        /* try to add to proc as well if it was initialized */
+        if (np->pde)
+                proc_device_tree_add_prop(np->pde, prop);
+#endif /* CONFIG_PROC_DEVICETREE */
+
+        return 0;
+}
+
+/*
+ * Remove a property from a node.  Note that we don't actually
+ * remove it, since we have given out who-knows-how-many pointers
+ * to the data using get-property.  Instead we just move the property
+ * to the "dead properties" list, so it won't be found any more.
+ */
+int prom_remove_property(struct device_node *np, struct property *prop)
+{
+        struct property **next;
+        unsigned long flags;
+        int found = 0;
+
+        write_lock_irqsave(&devtree_lock, flags);
+        next = &np->properties;
+        while (*next) {
+                if (*next == prop) {
+                        /* found the node */
+                        *next = prop->next;
+                        prop->next = np->deadprops;
+                        np->deadprops = prop;
+                        found = 1;
+                        break;
+                }
+                next = &(*next)->next;
+        }
+        write_unlock_irqrestore(&devtree_lock, flags);
+
+        if (!found)
+                return -ENODEV;
+
+#ifdef CONFIG_PROC_DEVICETREE
+        /* try to remove the proc node as well */
+        if (np->pde)
+                proc_device_tree_remove_prop(np->pde, prop);
+#endif /* CONFIG_PROC_DEVICETREE */
+
+        return 0;
+}
+
+/*
+ * Update a property in a node.  Note that we don't actually
+ * remove it, since we have given out who-knows-how-many pointers
+ * to the data using get-property.  Instead we just move the property
+ * to the "dead properties" list, and add the new property to the
+ * property list
+ */
+int prom_update_property(struct device_node *np,
+                         struct property *newprop,
+                         struct property *oldprop)
+{
+        struct property **next;
+        unsigned long flags;
+        int found = 0;
+
+        write_lock_irqsave(&devtree_lock, flags);
+        next = &np->properties;
+        while (*next) {
+                if (*next == oldprop) {
+                        /* found the node */
+                        newprop->next = oldprop->next;
+                        *next = newprop;
+                        oldprop->next = np->deadprops;
+                        np->deadprops = oldprop;
+                        found = 1;
+                        break;
+                }
+                next = &(*next)->next;
+        }
+        write_unlock_irqrestore(&devtree_lock, flags);
+
+        if (!found)
+                return -ENODEV;
+
+#ifdef CONFIG_PROC_DEVICETREE
+        /* try to add to proc as well if it was initialized */
+        if (np->pde)
+                proc_device_tree_update_prop(np->pde, newprop, oldprop);
+#endif /* CONFIG_PROC_DEVICETREE */
+
+        return 0;
+}
+
+#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
+static struct debugfs_blob_wrapper flat_dt_blob;
+
+static int __init export_flat_device_tree(void)
+{
+        struct dentry *d;
+
+        flat_dt_blob.data = initial_boot_params;
+        flat_dt_blob.size = initial_boot_params->totalsize;
+
+        d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
+                                of_debugfs_root, &flat_dt_blob);
+        if (!d)
+                return 1;
+
+        return 0;
+}
+device_initcall(export_flat_device_tree);
+#endif