arch/sparc/kernel/idprom.c

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