1 files changed, 543 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/prom.c b/arch/sparc64/kernel/prom.c
new file mode 100644
index 000000000000..c99b7aae19df
--- /dev/null
+++ b/arch/sparc64/kernel/prom.c
@@ -0,0 +1,543 @@
+/*
+ * 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 sparc64 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 <asm/prom.h>
+#include <asm/oplib.h>
+
+static struct device_node *allnodes;
+
+struct device_node *of_get_parent(const struct device_node *node)
+{
+        struct device_node *np;
+
+        if (!node)
+                return NULL;
+
+        np = node->parent;
+
+        return np;
+}
+
+struct device_node *of_get_next_child(const struct device_node *node,
+        struct device_node *prev)
+{
+        struct device_node *next;
+
+        next = prev ? prev->sibling : node->child;
+        for (; next != 0; next = next->sibling) {
+                break;
+        }
+
+        return next;
+}
+
+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 && strcmp(np->full_name, path) == 0)
+                        break;
+        }
+
+        return np;
+}
+
+struct property *of_find_property(struct device_node *np, const char *name,
+                                  int *lenp)
+{
+        struct property *pp;
+
+        for (pp = np->properties; pp != 0; pp = pp->next) {
+                if (strcmp(pp->name, name) == 0) {
+                        if (lenp != 0)
+                                *lenp = pp->length;
+                        break;
+                }
+        }
+        return pp;
+}
+
+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.
+ *
+ * As an example, the boot device on my workstation has a full path:
+ *
+ *      /pci@1e,600000/ide@d/disk@0,0:c
+ */
+static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct linux_prom64_registers *regs;
+        struct property *rprop;
+        u32 high_bits, low_bits, type;
+
+        rprop = of_find_property(dp, "reg", NULL);
+        if (!rprop)
+                return;
+
+        regs = rprop->value;
+        if (!is_root_node(dp->parent)) {
+                sprintf(tmp_buf, "%s@%x,%x",
+                        dp->name,
+                        (unsigned int) (regs->phys_addr >> 32UL),
+                        (unsigned int) (regs->phys_addr & 0xffffffffUL));
+                return;
+        }
+
+        type = regs->phys_addr >> 60UL;
+        high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
+        low_bits = (regs->phys_addr & 0xffffffffUL);
+
+        if (type == 0 || type == 8) {
+                const char *prefix = (type == 0) ? "m" : "i";
+
+                if (low_bits)
+                        sprintf(tmp_buf, "%s@%s%x,%x",
+                                dp->name, prefix,
+                                high_bits, low_bits);
+                else
+                        sprintf(tmp_buf, "%s@%s%x",
+                                dp->name,
+                                prefix,
+                                high_bits);
+        } else if (type == 12) {
+                sprintf(tmp_buf, "%s@%x",
+                        dp->name, high_bits);
+        }
+}
+
+static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct linux_prom64_registers *regs;
+        struct property *prop;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+        if (!is_root_node(dp->parent)) {
+                sprintf(tmp_buf, "%s@%x,%x",
+                        dp->name,
+                        (unsigned int) (regs->phys_addr >> 32UL),
+                        (unsigned int) (regs->phys_addr & 0xffffffffUL));
+                return;
+        }
+
+        prop = of_find_property(dp, "upa-portid", NULL);
+        if (!prop)
+                prop = of_find_property(dp, "portid", NULL);
+        if (prop) {
+                unsigned long mask = 0xffffffffUL;
+
+                if (tlb_type >= cheetah)
+                        mask = 0x7fffff;
+
+                sprintf(tmp_buf, "%s@%x,%x",
+                        dp->name,
+                        *(u32 *)prop->value,
+                        (unsigned int) (regs->phys_addr & mask));
+        }
+}
+
+/* "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@UPA_PORTID,offset" */
+static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct linux_prom64_registers *regs;
+        struct property *prop;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+
+        prop = of_find_property(dp, "upa-portid", NULL);
+        if (!prop)
+                return;
+
+        sprintf(tmp_buf, "%s@%x,%x",
+                dp->name,
+                *(u32 *) prop->value,
+                (unsigned int) (regs->phys_addr & 0xffffffffUL));
+}
+
+/* "name@reg" */
+static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct property *prop;
+        u32 *regs;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+
+        sprintf(tmp_buf, "%s@%x", dp->name, *regs);
+}
+
+/* "name@addrhi,addrlo" */
+static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct linux_prom64_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,
+                (unsigned int) (regs->phys_addr >> 32UL),
+                (unsigned int) (regs->phys_addr & 0xffffffffUL));
+}
+
+/* "name@bus,addr" */
+static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct property *prop;
+        u32 *regs;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+
+        /* This actually isn't right... should look at the #address-cells
+         * property of the i2c bus node etc. etc.
+         */
+        sprintf(tmp_buf, "%s@%x,%x",
+                dp->name, regs[0], regs[1]);
+}
+
+/* "name@reg0[,reg1]" */
+static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct property *prop;
+        u32 *regs;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+
+        if (prop->length == sizeof(u32) || regs[1] == 1) {
+                sprintf(tmp_buf, "%s@%x",
+                        dp->name, regs[0]);
+        } else {
+                sprintf(tmp_buf, "%s@%x,%x",
+                        dp->name, regs[0], regs[1]);
+        }
+}
+
+/* "name@reg0reg1[,reg2reg3]" */
+static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
+{
+        struct property *prop;
+        u32 *regs;
+
+        prop = of_find_property(dp, "reg", NULL);
+        if (!prop)
+                return;
+
+        regs = prop->value;
+
+        if (regs[2] || regs[3]) {
+                sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
+                        dp->name, regs[0], regs[1], regs[2], regs[3]);
+        } else {
+                sprintf(tmp_buf, "%s@%08x%08x",
+                        dp->name, regs[0], regs[1]);
+        }
+}
+
+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, "upa"))
+                        return upa_path_component(dp, tmp_buf);
+                if (!strcmp(parent->type, "ebus"))
+                        return ebus_path_component(dp, tmp_buf);
+                if (!strcmp(parent->name, "usb") ||
+                    !strcmp(parent->name, "hub"))
+                        return usb_path_component(dp, tmp_buf);
+                if (!strcmp(parent->type, "i2c"))
+                        return i2c_path_component(dp, tmp_buf);
+                if (!strcmp(parent->type, "firewire"))
+                        return ieee1394_path_component(dp, tmp_buf);
+                if (!strcmp(parent->type, "virtual-devices"))
+                        return vdev_path_component(dp, tmp_buf);
+
+                /* "isa" is handled with platform naming */
+        }
+
+        /* Use platform naming convention.  */
+        if (tlb_type == hypervisor)
+                return sun4v_path_component(dp, tmp_buf);
+        else
+                return sun4u_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 struct property * __init build_one_prop(phandle node, char *prev)
+{
+        static struct property *tmp = NULL;
+        struct property *p;
+
+        if (tmp) {
+                p = tmp;
+                memset(p, 0, sizeof(*p) + 32);
+                tmp = NULL;
+        } else
+                p = prom_early_alloc(sizeof(struct property) + 32);
+
+        p->name = (char *) (p + 1);
+        if (prev == NULL) {
+                prom_firstprop(node, p->name);
+        } else {
+                prom_nextprop(node, prev, p->name);
+        }
+        if (strlen(p->name) == 0) {
+                tmp = p;
+                return NULL;
+        }
+        p->length = prom_getproplen(node, p->name);
+        if (p->length <= 0) {
+                p->length = 0;
+        } else {
+                p->value = prom_early_alloc(p->length);
+                prom_getproperty(node, p->name, p->value, p->length);
+        }
+        return p;
+}
+
+static struct property * __init build_prop_list(phandle node)
+{
+        struct property *head, *tail;
+
+        head = tail = build_one_prop(node, NULL);
+        while(tail) {
+                tail->next = build_one_prop(node, tail->name);
+                tail = tail->next;
+        }
+
+        return head;
+}
+
+static char * __init get_one_property(phandle node, const char *name)
+{
+        char *buf = "<NULL>";
+        int len;
+
+        len = prom_getproplen(node, name);
+        if (len > 0) {
+                buf = prom_early_alloc(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));
+
+        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;
+}
+
+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);
+        printk("PROM: Built device tree with %u bytes of memory.\n",
+               prom_early_allocated);
+}