release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/boot/fsl-soc.c

   1 /*
   2  * Freescale SOC support functions
   3  *
   4  * Author: Scott Wood <scottwood@freescale.com>
   5  *
   6  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  */
  12
  13 #include "ops.h"
  14 #include "types.h"
  15 #include "fsl-soc.h"
  16 #include "stdio.h"
  17
  18 static u32 prop_buf[MAX_PROP_LEN / 4];
  19
  20 u32 *fsl_get_immr(void)
  21 {
  22         void *soc;
  23         unsigned long ret = 0;
  24
  25         soc = find_node_by_devtype(NULL, "soc");
  26         if (soc) {
  27                 int size;
  28                 u32 naddr;
  29
  30                 size = getprop(soc, "#address-cells", prop_buf, MAX_PROP_LEN);
  31                 if (size == 4)
  32                         naddr = prop_buf[0];
  33                 else
  34                         naddr = 2;
  35
  36                 if (naddr != 1 && naddr != 2)
  37                         goto err;
  38
  39                 size = getprop(soc, "ranges", prop_buf, MAX_PROP_LEN);
  40
  41                 if (size < 12)
  42                         goto err;
  43                 if (prop_buf[0] != 0)
  44                         goto err;
  45                 if (naddr == 2 && prop_buf[1] != 0)
  46                         goto err;
  47
  48                 if (!dt_xlate_addr(soc, prop_buf + naddr, 8, &ret))
  49                         ret = 0;
  50         }
  51
  52 err:
  53         if (!ret)
  54                 printf("fsl_get_immr: Failed to find immr base\r\n");
  55
  56         return (u32 *)ret;
  57 }