arch/powerpc/boot/fsl-soc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Freescale SOC support functions
   4  *
   5  * Author: Scott Wood <scottwood@freescale.com>
   6  *
   7  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   8  */
   9
  10 #include "ops.h"
  11 #include "types.h"
  12 #include "fsl-soc.h"
  13 #include "stdio.h"
  14
  15 static u32 prop_buf[MAX_PROP_LEN / 4];
  16
  17 u32 *fsl_get_immr(void)
  18 {
  19         void *soc;
  20         unsigned long ret = 0;
  21
  22         soc = find_node_by_devtype(NULL, "soc");
  23         if (soc) {
  24                 int size;
  25                 u32 naddr;
  26
  27                 size = getprop(soc, "#address-cells", prop_buf, MAX_PROP_LEN);
  28                 if (size == 4)
  29                         naddr = prop_buf[0];
  30                 else
  31                         naddr = 2;
  32
  33                 if (naddr != 1 && naddr != 2)
  34                         goto err;
  35
  36                 size = getprop(soc, "ranges", prop_buf, MAX_PROP_LEN);
  37
  38                 if (size < 12)
  39                         goto err;
  40                 if (prop_buf[0] != 0)
  41                         goto err;
  42                 if (naddr == 2 && prop_buf[1] != 0)
  43                         goto err;
  44
  45                 if (!dt_xlate_addr(soc, prop_buf + naddr, 8, &ret))
  46                         ret = 0;
  47         }
  48
  49 err:
  50         if (!ret)
  51                 printf("fsl_get_immr: Failed to find immr base\r\n");
  52
  53         return (u32 *)ret;
  54 }