arch/c6x/kernel/soc.c

   1 /*
   2  *  Miscellaneous SoC-specific hooks.
   3  *
   4  *  Copyright (C) 2011 Texas Instruments Incorporated
   5  *  Author: Mark Salter <msalter@redhat.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/ctype.h>
  13 #include <linux/etherdevice.h>
  14 #include <asm/setup.h>
  15 #include <asm/soc.h>
  16
  17 struct soc_ops soc_ops;
  18
  19 int soc_get_exception(void)
  20 {
  21         if (!soc_ops.get_exception)
  22                 return -1;
  23         return soc_ops.get_exception();
  24 }
  25
  26 void soc_assert_event(unsigned int evt)
  27 {
  28         if (soc_ops.assert_event)
  29                 soc_ops.assert_event(evt);
  30 }
  31
  32 static u8 cmdline_mac[6];
  33
  34 static int __init get_mac_addr_from_cmdline(char *str)
  35 {
  36         int count, i, val;
  37
  38         for (count = 0; count < 6 && *str; count++, str += 3) {
  39                 if (!isxdigit(str[0]) || !isxdigit(str[1]))
  40                         return 0;
  41                 if (str[2] != ((count < 5) ? ':' : '\0'))
  42                         return 0;
  43
  44                 for (i = 0, val = 0; i < 2; i++) {
  45                         val = val << 4;
  46                         val |= isdigit(str[i]) ?
  47                                 str[i] - '0' : toupper(str[i]) - 'A' + 10;
  48                 }
  49                 cmdline_mac[count] = val;
  50         }
  51         return 1;
  52 }
  53 __setup("emac_addr=", get_mac_addr_from_cmdline);
  54
  55 /*
  56  * Setup the MAC address for SoC ethernet devices.
  57  *
  58  * Before calling this function, the ethernet driver will have
  59  * initialized the addr with local-mac-address from the device
  60  * tree (if found). Allow command line to override, but not
  61  * the fused address.
  62  */
  63 int soc_mac_addr(unsigned int index, u8 *addr)
  64 {
  65         int i, have_dt_mac = 0, have_cmdline_mac = 0, have_fuse_mac = 0;
  66
  67         for (i = 0; i < 6; i++) {
  68                 if (cmdline_mac[i])
  69                         have_cmdline_mac = 1;
  70                 if (c6x_fuse_mac[i])
  71                         have_fuse_mac = 1;
  72                 if (addr[i])
  73                         have_dt_mac = 1;
  74         }
  75
  76         /* cmdline overrides all */
  77         if (have_cmdline_mac)
  78                 memcpy(addr, cmdline_mac, 6);
  79         else if (!have_dt_mac) {
  80                 if (have_fuse_mac)
  81                         memcpy(addr, c6x_fuse_mac, 6);
  82                 else
  83                         eth_random_addr(addr);
  84         }
  85
  86         /* adjust for specific EMAC device */
  87         addr[5] += index * c6x_num_cores;
  88         return 1;
  89 }
  90 EXPORT_SYMBOL_GPL(soc_mac_addr);