arch/ppc/cpu/mpc8xxx/fdt.c

   1 /*
   2  * Copyright 2009 Freescale Semiconductor, Inc.
   3  *
   4  * This file is derived from arch/ppc/cpu/mpc85xx/cpu.c and
   5  * arch/ppc/cpu/mpc86xx/cpu.c. Basically this file contains
   6  * cpu specific common code for 85xx/86xx processors.
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <common.h>
  27 #include <libfdt.h>
  28 #include <fdt_support.h>
  29
  30 void ft_fixup_num_cores(void *blob) {
  31         int off, num_cores, del_cores;
  32
  33         del_cores = 0;
  34         num_cores = cpu_numcores();
  35
  36         off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
  37         while (off != -FDT_ERR_NOTFOUND) {
  38                 u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", 0);
  39
  40                 /* if we find a cpu node outside of what we expect delete it
  41                  * and reset the offset back to the start since we can't
  42                  * trust the offsets anymore
  43                  */
  44                 if (*reg > num_cores-1) {
  45                         fdt_del_node(blob, off);
  46                         del_cores++;
  47                         off = -1;
  48                 }
  49                 off = fdt_node_offset_by_prop_value(blob, off,
  50                                 "device_type", "cpu", 4);
  51         }
  52         debug ("%x core system found\n", num_cores);
  53         debug ("deleted %d extra core entry entries from device tree\n",
  54                                                                 del_cores);
  55 }