lib/libfdt/fdt_addresses.c

   1 /*
   2  * libfdt - Flat Device Tree manipulation
   3  * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
   4  * SPDX-License-Identifier:     GPL-2.0+ BSD-2-Clause
   5  */
   6 #include "libfdt_env.h"
   7
   8 #ifndef USE_HOSTCC
   9 #include <fdt.h>
  10 #include <libfdt.h>
  11 #else
  12 #include "fdt_host.h"
  13 #endif
  14
  15 #include "libfdt_internal.h"
  16
  17 int fdt_address_cells(const void *fdt, int nodeoffset)
  18 {
  19         const fdt32_t *ac;
  20         int val;
  21         int len;
  22
  23         ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len);
  24         if (!ac)
  25                 return 2;
  26
  27         if (len != sizeof(*ac))
  28                 return -FDT_ERR_BADNCELLS;
  29
  30         val = fdt32_to_cpu(*ac);
  31         if ((val <= 0) || (val > FDT_MAX_NCELLS))
  32                 return -FDT_ERR_BADNCELLS;
  33
  34         return val;
  35 }
  36
  37 int fdt_size_cells(const void *fdt, int nodeoffset)
  38 {
  39         const fdt32_t *sc;
  40         int val;
  41         int len;
  42
  43         sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len);
  44         if (!sc)
  45                 return 2;
  46
  47         if (len != sizeof(*sc))
  48                 return -FDT_ERR_BADNCELLS;
  49
  50         val = fdt32_to_cpu(*sc);
  51         if ((val < 0) || (val > FDT_MAX_NCELLS))
  52                 return -FDT_ERR_BADNCELLS;
  53
  54         return val;
  55 }