arch/c6x/kernel/soc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Miscellaneous SoC-specific hooks.
   4  *
   5  *  Copyright (C) 2011 Texas Instruments Incorporated
   6  *  Author: Mark Salter <msalter@redhat.com>
   7  */
   8 #include <linux/module.h>
   9 #include <linux/ctype.h>
  10 #include <linux/etherdevice.h>
  11 #include <asm/setup.h>
  12 #include <asm/soc.h>
  13
  14 struct soc_ops soc_ops;
  15
  16 int soc_get_exception(void)
  17 {
  18         if (!soc_ops.get_exception)
  19                 return -1;
  20         return soc_ops.get_exception();
  21 }
  22
  23 void soc_assert_event(unsigned int evt)
  24 {
  25         if (soc_ops.assert_event)
  26                 soc_ops.assert_event(evt);
  27 }
  28
  29 static u8 cmdline_mac[6];
  30
  31 static int __init get_mac_addr_from_cmdline(char *str)
  32 {
  33         int count, i, val;
  34
  35         for (count = 0; count < 6 && *str; count++, str += 3) {
  36                 if (!isxdigit(str[0]) || !isxdigit(str[1]))
  37                         return 0;
  38                 if (str[2] != ((count < 5) ? ':' : '\0'))
  39                         return 0;
  40
  41                 for (i = 0, val = 0; i < 2; i++) {
  42                         val = val << 4;
  43                         val |= isdigit(str[i]) ?
  44                                 str[i] - '0' : toupper(str[i]) - 'A' + 10;
  45                 }
  46                 cmdline_mac[count] = val;
  47         }
  48         return 1;
  49 }
  50 __setup("emac_addr=", get_mac_addr_from_cmdline);
  51
  52 /*
  53  * Setup the MAC address for SoC ethernet devices.
  54  *
  55  * Before calling this function, the ethernet driver will have
  56  * initialized the addr with local-mac-address from the device
  57  * tree (if found). Allow command line to override, but not
  58  * the fused address.
  59  */
  60 int soc_mac_addr(unsigned int index, u8 *addr)
  61 {
  62         int i, have_dt_mac = 0, have_cmdline_mac = 0, have_fuse_mac = 0;
  63
  64         for (i = 0; i < 6; i++) {
  65                 if (cmdline_mac[i])
  66                         have_cmdline_mac = 1;
  67                 if (c6x_fuse_mac[i])
  68                         have_fuse_mac = 1;
  69                 if (addr[i])
  70                         have_dt_mac = 1;
  71         }
  72
  73         /* cmdline overrides all */
  74         if (have_cmdline_mac)
  75                 memcpy(addr, cmdline_mac, 6);
  76         else if (!have_dt_mac) {
  77                 if (have_fuse_mac)
  78                         memcpy(addr, c6x_fuse_mac, 6);
  79                 else
  80                         eth_random_addr(addr);
  81         }
  82
  83         /* adjust for specific EMAC device */
  84         addr[5] += index * c6x_num_cores;
  85         return 1;
  86 }
  87 EXPORT_SYMBOL_GPL(soc_mac_addr);