arch/sparc/kernel/idprom.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * idprom.c: Routines to load the idprom into kernel addresses and
   4  *           interpret the data contained within.
   5  *
   6  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/types.h>
  11 #include <linux/init.h>
  12 #include <linux/export.h>
  13 #include <linux/etherdevice.h>
  14
  15 #include <asm/oplib.h>
  16 #include <asm/idprom.h>
  17
  18 struct idprom *idprom;
  19 EXPORT_SYMBOL(idprom);
  20
  21 static struct idprom idprom_buffer;
  22
  23 #ifdef CONFIG_SPARC32
  24 #include <asm/machines.h>  /* Fun with Sun released architectures. */
  25
  26 /* Here is the master table of Sun machines which use some implementation
  27  * of the Sparc CPU and have a meaningful IDPROM machtype value that we
  28  * know about.  See asm-sparc/machines.h for empirical constants.
  29  */
  30 static struct Sun_Machine_Models Sun_Machines[] = {
  31 /* First, Leon */
  32 { .name = "Leon3 System-on-a-Chip",  .id_machtype = (M_LEON | M_LEON3_SOC) },
  33 /* Finally, early Sun4m's */
  34 { .name = "Sun4m SparcSystem600",    .id_machtype = (SM_SUN4M | SM_4M_SS60) },
  35 { .name = "Sun4m SparcStation10/20", .id_machtype = (SM_SUN4M | SM_4M_SS50) },
  36 { .name = "Sun4m SparcStation5",     .id_machtype = (SM_SUN4M | SM_4M_SS40) },
  37 /* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
  38 { .name = "Sun4M OBP based system",  .id_machtype = (SM_SUN4M_OBP | 0x0) } };
  39
  40 static void __init display_system_type(unsigned char machtype)
  41 {
  42         char sysname[128];
  43         register int i;
  44
  45         for (i = 0; i < ARRAY_SIZE(Sun_Machines); i++) {
  46                 if (Sun_Machines[i].id_machtype == machtype) {
  47                         if (machtype != (SM_SUN4M_OBP | 0x00) ||
  48                             prom_getproperty(prom_root_node, "banner-name",
  49                                              sysname, sizeof(sysname)) <= 0)
  50                                 printk(KERN_WARNING "TYPE: %s\n",
  51                                        Sun_Machines[i].name);
  52                         else
  53                                 printk(KERN_WARNING "TYPE: %s\n", sysname);
  54                         return;
  55                 }
  56         }
  57
  58         prom_printf("IDPROM: Warning, bogus id_machtype value, 0x%x\n", machtype);
  59 }
  60 #else
  61 static void __init display_system_type(unsigned char machtype)
  62 {
  63 }
  64 #endif
  65
  66 unsigned char *arch_get_platform_mac_address(void)
  67 {
  68         return idprom->id_ethaddr;
  69 }
  70
  71 /* Calculate the IDPROM checksum (xor of the data bytes). */
  72 static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
  73 {
  74         unsigned char cksum, i, *ptr = (unsigned char *)idprom;
  75
  76         for (i = cksum = 0; i <= 0x0E; i++)
  77                 cksum ^= *ptr++;
  78
  79         return cksum;
  80 }
  81
  82 /* Create a local IDPROM copy, verify integrity, and display information. */
  83 void __init idprom_init(void)
  84 {
  85         prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
  86
  87         idprom = &idprom_buffer;
  88
  89         if (idprom->id_format != 0x01)
  90                 prom_printf("IDPROM: Warning, unknown format type!\n");
  91
  92         if (idprom->id_cksum != calc_idprom_cksum(idprom))
  93                 prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
  94                             idprom->id_cksum, calc_idprom_cksum(idprom));
  95
  96         display_system_type(idprom->id_machtype);
  97
  98         printk(KERN_WARNING "Ethernet address: %pM\n", idprom->id_ethaddr);
  99 }