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prom.c

/*
 * 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);

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;

                  ret = prom_setprop(dp->node, (char *) name, val, len);
                  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:
      case PROM_SUN4:
            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);
}

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