1 files changed, 566 insertions, 0 deletions

diff --git a/arch/sparc/kernel/prom_32.c b/arch/sparc/kernel/prom_32.c
new file mode 100644
index 000000000000..eee5efcfe50e
--- /dev/null
+++ b/arch/sparc/kernel/prom_32.c
@@ -0,0 +1,566 @@
+/*
+ * 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 
+ *
+ *  Adapted for sparc32 by David S. Miller davem@davemloft.net
+ *
+ *      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 <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/module.h>
+
+#include <asm/prom.h>
+#include <asm/oplib.h>
+
+extern struct device_node *allnodes;    /* temporary while merging */
+
+extern rwlock_t devtree_lock;   /* temporary while merging */
+
+struct device_node *of_find_node_by_phandle(phandle handle)
+{
+        struct device_node *np;
+
+        for (np = allnodes; np != 0; np = np->allnext)
+                if (np->node == handle)
+                        break;
+
+        return np;
+}
+EXPORT_SYMBOL(of_find_node_by_phandle);
+
+int of_getintprop_default(struct device_node *np, const char *name, int def)
+{
+        struct property *prop;
+        int len;
+
+        prop = of_find_property(np, name, &len);
+        if (!prop || len != 4)
+                return def;
+
+        return *(int *) prop->value;
+}
+EXPORT_SYMBOL(of_getintprop_default);
+
+DEFINE_MUTEX(of_set_property_mutex);
+EXPORT_SYMBOL(of_set_property_mutex);
+
+int of_set_property(struct device_node *dp, const char *name, void *val, int len)
+{
+        struct property **prevp;
+        void *new_val;
+        int err;
+
+        new_val = kmalloc(len, GFP_KERNEL);
+        if (!new_val)
+                return -ENOMEM;
+
+        memcpy(new_val, val, len);
+
+        err = -ENODEV;
+
+        write_lock(&devtree_lock);
+        prevp = &dp->properties;
+        while (*prevp) {
+                struct property *prop = *prevp;
+
+                if (!strcasecmp(prop->name, name)) {
+                        void *old_val = prop->value;
+                        int ret;
+
+                        mutex_lock(&of_set_property_mutex);
+                        ret = prom_setprop(dp->node, (char *) name, val, len);
+                        mutex_unlock(&of_set_property_mutex);
+
+                        err = -EINVAL;
+                        if (ret >= 0) {
+                                prop->value = new_val;
+                                prop->length = len;
+
+                                if (OF_IS_DYNAMIC(prop))
+                                        kfree(old_val);
+
+                                OF_MARK_DYNAMIC(prop);
+
+                                err = 0;
+                        }
+                        break;
+                }
+                prevp = &(*prevp)->next;
+        }
+        write_unlock(&devtree_lock);
+
+        /* XXX Upate procfs if necessary... */
+
+        return err;
+}
+EXPORT_SYMBOL(of_set_property);
+
+int of_find_in_proplist(const char *list, const char *match, int len)
+{
+        while (len > 0) {
+                int l;
+
+                if (!strcmp(list, match))
+                        return 1;
+                l = strlen(list) + 1;
+                list += l;
+                len -= l;
+        }
+        return 0;
+}
+EXPORT_SYMBOL(of_find_in_proplist);
+
+static unsigned int prom_early_allocated;
+
+static void * __init prom_early_alloc(unsigned long size)
+{
+        void *ret;
+
+        ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
+        if (ret != NULL)
+                memset(ret, 0, size);
+
+        prom_early_allocated += size;
+
+        return ret;
+}
+
+static int is_root_node(const struct device_node *dp)
+{
+        if (!dp)
+                return 0;
+
+        return (dp->parent == NULL);
+}
+
+/* The following routines deal with the black magic of fully naming a
+ * node.
+ *
+ * Certain well known named nodes are just the simple name string.
+ *
+ * Actual devices have an address specifier appended to the base name
+ * string, like this "foo@addr".  The "addr" can be in any number of
+ * formats, and the platform plus the type of the node determine the
+ * format and how it is constructed.
+ *
+ * For children of the ROOT node, the naming convention is fixed and
+ * determined by whether this is a sun4u or sun4v system.
+ *
+ * For children of other nodes, it is bus type specific.  So
+ * we walk up the tree until we discover a "device_type" property
+ * we recognize and we go from there.
+ */
+static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct linux_prom_registers *regs;
+        struct property *rprop;
+
+        rprop = of_find_property(dp, "reg", NULL);
+        if (!rprop)
+                return;
+
+        regs = rprop->value;
+        sprintf(tmp_buf, "%s@%x,%x",
+                dp->name,
+                regs->which_io, regs->phys_addr);
+}
+
+/* "name@slot,offset"  */
+static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct linux_prom_registers *regs;
+        struct property *prop;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+        sprintf(tmp_buf, "%s@%x,%x",
+                dp->name,
+                regs->which_io,
+                regs->phys_addr);
+}
+
+/* "name@devnum[,func]" */
+static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct linux_prom_pci_registers *regs;
+        struct property *prop;
+        unsigned int devfn;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+        devfn = (regs->phys_hi >> 8) & 0xff;
+        if (devfn & 0x07) {
+                sprintf(tmp_buf, "%s@%x,%x",
+                        dp->name,
+                        devfn >> 3,
+                        devfn & 0x07);
+        } else {
+                sprintf(tmp_buf, "%s@%x",
+                        dp->name,
+                        devfn >> 3);
+        }
+}
+
+/* "name@addrhi,addrlo" */
+static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct linux_prom_registers *regs;
+        struct property *prop;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+
+        sprintf(tmp_buf, "%s@%x,%x",
+                dp->name,
+                regs->which_io, regs->phys_addr);
+}
+
+static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct device_node *parent = dp->parent;
+
+        if (parent != NULL) {
+                if (!strcmp(parent->type, "pci") ||
+                    !strcmp(parent->type, "pciex"))
+                        return pci_path_component(dp, tmp_buf);
+                if (!strcmp(parent->type, "sbus"))
+                        return sbus_path_component(dp, tmp_buf);
+                if (!strcmp(parent->type, "ebus"))
+                        return ebus_path_component(dp, tmp_buf);
+
+                /* "isa" is handled with platform naming */
+        }
+
+        /* Use platform naming convention.  */
+        return sparc32_path_component(dp, tmp_buf);
+}
+
+static char * __init build_path_component(struct device_node *dp)
+{
+        char tmp_buf[64], *n;
+
+        tmp_buf[0] = '\0';
+        __build_path_component(dp, tmp_buf);
+        if (tmp_buf[0] == '\0')
+                strcpy(tmp_buf, dp->name);
+
+        n = prom_early_alloc(strlen(tmp_buf) + 1);
+        strcpy(n, tmp_buf);
+
+        return n;
+}
+
+static char * __init build_full_name(struct device_node *dp)
+{
+        int len, ourlen, plen;
+        char *n;
+
+        plen = strlen(dp->parent->full_name);
+        ourlen = strlen(dp->path_component_name);
+        len = ourlen + plen + 2;
+
+        n = prom_early_alloc(len);
+        strcpy(n, dp->parent->full_name);
+        if (!is_root_node(dp->parent)) {
+                strcpy(n + plen, "/");
+                plen++;
+        }
+        strcpy(n + plen, dp->path_component_name);
+
+        return n;
+}
+
+static unsigned int unique_id;
+
+static struct property * __init build_one_prop(phandle node, char *prev, char *special_name, void *special_val, int special_len)
+{
+        static struct property *tmp = NULL;
+        struct property *p;
+        int len;
+        const char *name;
+
+        if (tmp) {
+                p = tmp;
+                memset(p, 0, sizeof(*p) + 32);
+                tmp = NULL;
+        } else {
+                p = prom_early_alloc(sizeof(struct property) + 32);
+                p->unique_id = unique_id++;
+        }
+
+        p->name = (char *) (p + 1);
+        if (special_name) {
+                strcpy(p->name, special_name);
+                p->length = special_len;
+                p->value = prom_early_alloc(special_len);
+                memcpy(p->value, special_val, special_len);
+        } else {
+                if (prev == NULL) {
+                        name = prom_firstprop(node, NULL);
+                } else {
+                        name = prom_nextprop(node, prev, NULL);
+                }
+                if (strlen(name) == 0) {
+                        tmp = p;
+                        return NULL;
+                }
+                strcpy(p->name, name);
+                p->length = prom_getproplen(node, p->name);
+                if (p->length <= 0) {
+                        p->length = 0;
+                } else {
+                        p->value = prom_early_alloc(p->length + 1);
+                        len = prom_getproperty(node, p->name, p->value,
+                                               p->length);
+                        if (len <= 0)
+                                p->length = 0;
+                        ((unsigned char *)p->value)[p->length] = '\0';
+                }
+        }
+        return p;
+}
+
+static struct property * __init build_prop_list(phandle node)
+{
+        struct property *head, *tail;
+
+        head = tail = build_one_prop(node, NULL,
+                                     ".node", &node, sizeof(node));
+
+        tail->next = build_one_prop(node, NULL, NULL, NULL, 0);
+        tail = tail->next;
+        while(tail) {
+                tail->next = build_one_prop(node, tail->name,
+                                            NULL, NULL, 0);
+                tail = tail->next;
+        }
+
+        return head;
+}
+
+static char * __init get_one_property(phandle node, char *name)
+{
+        char *buf = "<NULL>";
+        int len;
+
+        len = prom_getproplen(node, name);
+        if (len > 0) {
+                buf = prom_early_alloc(len);
+                len = prom_getproperty(node, name, buf, len);
+        }
+
+        return buf;
+}
+
+static struct device_node * __init create_node(phandle node)
+{
+        struct device_node *dp;
+
+        if (!node)
+                return NULL;
+
+        dp = prom_early_alloc(sizeof(*dp));
+        dp->unique_id = unique_id++;
+
+        kref_init(&dp->kref);
+
+        dp->name = get_one_property(node, "name");
+        dp->type = get_one_property(node, "device_type");
+        dp->node = node;
+
+        /* Build interrupts later... */
+
+        dp->properties = build_prop_list(node);
+
+        return dp;
+}
+
+static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp)
+{
+        struct device_node *dp;
+
+        dp = create_node(node);
+        if (dp) {
+                *(*nextp) = dp;
+                *nextp = &dp->allnext;
+
+                dp->parent = parent;
+                dp->path_component_name = build_path_component(dp);
+                dp->full_name = build_full_name(dp);
+
+                dp->child = build_tree(dp, prom_getchild(node), nextp);
+
+                dp->sibling = build_tree(parent, prom_getsibling(node), nextp);
+        }
+
+        return dp;
+}
+
+struct device_node *of_console_device;
+EXPORT_SYMBOL(of_console_device);
+
+char *of_console_path;
+EXPORT_SYMBOL(of_console_path);
+
+char *of_console_options;
+EXPORT_SYMBOL(of_console_options);
+
+extern void restore_current(void);
+
+static void __init of_console_init(void)
+{
+        char *msg = "OF stdout device is: %s\n";
+        struct device_node *dp;
+        unsigned long flags;
+        const char *type;
+        phandle node;
+        int skip, tmp, fd;
+
+        of_console_path = prom_early_alloc(256);
+
+        switch (prom_vers) {
+        case PROM_V0:
+                skip = 0;
+                switch (*romvec->pv_stdout) {
+                case PROMDEV_SCREEN:
+                        type = "display";
+                        break;
+
+                case PROMDEV_TTYB:
+                        skip = 1;
+                        /* FALLTHRU */
+
+                case PROMDEV_TTYA:
+                        type = "serial";
+                        break;
+
+                default:
+                        prom_printf("Invalid PROM_V0 stdout value %u\n",
+                                    *romvec->pv_stdout);
+                        prom_halt();
+                }
+
+                tmp = skip;
+                for_each_node_by_type(dp, type) {
+                        if (!tmp--)
+                                break;
+                }
+                if (!dp) {
+                        prom_printf("Cannot find PROM_V0 console node.\n");
+                        prom_halt();
+                }
+                of_console_device = dp;
+
+                strcpy(of_console_path, dp->full_name);
+                if (!strcmp(type, "serial")) {
+                        strcat(of_console_path,
+                               (skip ? ":b" : ":a"));
+                }
+                break;
+
+        default:
+        case PROM_V2:
+        case PROM_V3:
+                fd = *romvec->pv_v2bootargs.fd_stdout;
+
+                spin_lock_irqsave(&prom_lock, flags);
+                node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
+                restore_current();
+                spin_unlock_irqrestore(&prom_lock, flags);
+
+                if (!node) {
+                        prom_printf("Cannot resolve stdout node from "
+                                    "instance %08x.\n", fd);
+                        prom_halt();
+                }
+                dp = of_find_node_by_phandle(node);
+                type = of_get_property(dp, "device_type", NULL);
+
+                if (!type) {
+                        prom_printf("Console stdout lacks "
+                                    "device_type property.\n");
+                        prom_halt();
+                }
+
+                if (strcmp(type, "display") && strcmp(type, "serial")) {
+                        prom_printf("Console device_type is neither display "
+                                    "nor serial.\n");
+                        prom_halt();
+                }
+
+                of_console_device = dp;
+
+                if (prom_vers == PROM_V2) {
+                        strcpy(of_console_path, dp->full_name);
+                        switch (*romvec->pv_stdout) {
+                        case PROMDEV_TTYA:
+                                strcat(of_console_path, ":a");
+                                break;
+                        case PROMDEV_TTYB:
+                                strcat(of_console_path, ":b");
+                                break;
+                        }
+                } else {
+                        const char *path;
+
+                        dp = of_find_node_by_path("/");
+                        path = of_get_property(dp, "stdout-path", NULL);
+                        if (!path) {
+                                prom_printf("No stdout-path in root node.\n");
+                                prom_halt();
+                        }
+                        strcpy(of_console_path, path);
+                }
+                break;
+        }
+
+        of_console_options = strrchr(of_console_path, ':');
+        if (of_console_options) {
+                of_console_options++;
+                if (*of_console_options == '\0')
+                        of_console_options = NULL;
+        }
+
+        prom_printf(msg, of_console_path);
+        printk(msg, of_console_path);
+}
+
+void __init prom_build_devicetree(void)
+{
+        struct device_node **nextp;
+
+        allnodes = create_node(prom_root_node);
+        allnodes->path_component_name = "";
+        allnodes->full_name = "/";
+
+        nextp = &allnodes->allnext;
+        allnodes->child = build_tree(allnodes,
+                                     prom_getchild(allnodes->node),
+                                     &nextp);
+        of_console_init();
+
+        printk("PROM: Built device tree with %u bytes of memory.\n",
+               prom_early_allocated);
+}