target/linux/kirkwood/patches-3.10/0050-of-add-support-for-parsing-mac-addresses-from-mtd.patch

   1 From f7d3f7790b75b098e1c92530dc3d28ba3b40b5a4 Mon Sep 17 00:00:00 2001
   2 From: Jonas Gorski <jogo@openwrt.org>
   3 Date: Sat, 10 Aug 2013 12:48:51 +0200
   4 Subject: [PATCH 28/29] of: add support for parsing mac addresses from mtd
   5
   6 Signed-off-by: Jonas Gorski <jogo@openwrt.org>
   7 ---
   8  drivers/of/of_net.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++-
   9  1 file changed, 99 insertions(+), 1 deletion(-)
  10
  11 --- a/drivers/of/of_net.c
  12 +++ b/drivers/of/of_net.c
  13 @@ -10,6 +10,7 @@
  14  #include <linux/of_net.h>
  15  #include <linux/phy.h>
  16  #include <linux/export.h>
  17 +#include <linux/mtd/mtd.h>
  18
  19  /**
  20   * It maps 'enum phy_interface_t' found in include/linux/phy.h
  21 @@ -55,6 +56,103 @@ const int of_get_phy_mode(struct device_
  22  }
  23  EXPORT_SYMBOL_GPL(of_get_phy_mode);
  24
  25 +static const void *of_get_mac_address_mtd(struct device_node *np)
  26 +{
  27 +       const __be32 *list;
  28 +       int size, ret;
  29 +       size_t ret_len;
  30 +       phandle phandle;
  31 +       struct device_node *part_node;
  32 +       struct mtd_info *mtd;
  33 +       const char *part;
  34 +       u8 mac[ETH_ALEN];
  35 +       u64 offset;
  36 +       bool parse_mac = false;
  37 +
  38 +       if (!IS_ENABLED(CONFIG_MTD))
  39 +               return NULL;
  40 +
  41 +       list = of_get_property(np, "mtd-mac-address", &size);
  42 +
  43 +       if (!list) {
  44 +               list = of_get_property(np, "mtd-mac-address-string", &size);
  45 +               parse_mac = true;
  46 +       }
  47 +
  48 +       if (!list)
  49 +               return NULL;
  50 +
  51 +       if (size != sizeof(*list) * 2)
  52 +               return NULL;
  53 +
  54 +       phandle = be32_to_cpup(list++);
  55 +       if (!phandle)
  56 +               return NULL;
  57 +
  58 +       part_node = of_find_node_by_phandle(phandle);
  59 +       if (!part_node)
  60 +               return NULL;
  61 +
  62 +       offset = be32_to_cpup(list++);
  63 +
  64 +       part = of_get_property(part_node, "label", NULL);
  65 +       if (!part)
  66 +               part = part_node->name;
  67 +
  68 +       mtd = get_mtd_device_nm(part);
  69 +
  70 +       of_node_put(part_node);
  71 +
  72 +       if (IS_ERR(mtd))
  73 +               return NULL;
  74 +
  75 +       if (parse_mac) {
  76 +               u8 mac_str[18];
  77 +
  78 +               ret = mtd_read(mtd, offset, 18, &ret_len, (u_char *)&mac_str);
  79 +               if (!ret && ret_len != 18)
  80 +                       ret = -EIO;
  81 +
  82 +               if (!ret)
  83 +                       ret_len = sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
  84 +                                        mac, mac + 1, mac + 2, mac + 3,
  85 +                                        mac + 4, mac + 5);
  86 +
  87 +       } else {
  88 +               ret = mtd_read(mtd, offset, ETH_ALEN, &ret_len, (u_char *)&mac);
  89 +       }
  90 +
  91 +       put_mtd_device(mtd);
  92 +
  93 +       if (!ret && ret_len == ETH_ALEN && is_valid_ether_addr(mac)) {
  94 +               struct property *pp = kzalloc(sizeof(*pp), GFP_KERNEL);
  95 +
  96 +               if (!pp)
  97 +                       return NULL;
  98 +
  99 +               pp->name = kstrdup("mac-address", GFP_KERNEL);
 100 +               pp->value = kzalloc(ETH_ALEN, GFP_KERNEL);
 101 +
 102 +               if (!pp->name || !pp->value) {
 103 +                       kfree(pp->name);
 104 +                       kfree(pp);
 105 +                       return NULL;
 106 +               }
 107 +
 108 +               memcpy(pp->value, mac, ETH_ALEN);
 109 +               pp->length = ETH_ALEN;
 110 +
 111 +               if (of_find_property(np, "mac-address", NULL))
 112 +                       of_update_property(np, pp);
 113 +               else
 114 +                       of_add_property(np, pp);
 115 +
 116 +               return pp->value;
 117 +       }
 118 +
 119 +       return NULL;
 120 +}
 121 +
 122  /**
 123   * Search the device tree for the best MAC address to use.  'mac-address' is
 124   * checked first, because that is supposed to contain to "most recent" MAC
 125 @@ -89,6 +187,6 @@ const void *of_get_mac_address(struct de
 126         if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
 127                 return pp->value;
 128
 129 -       return NULL;
 130 +       return of_get_mac_address_mtd(np);
 131  }
 132  EXPORT_SYMBOL(of_get_mac_address);