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/module.h>
  12
  13 #include <asm/oplib.h>
  14 #include <asm/idprom.h>
  15
  16 struct idprom *idprom;
  17 EXPORT_SYMBOL(idprom);
  18
  19 static struct idprom idprom_buffer;
  20
  21 #ifdef CONFIG_SPARC32
  22 #include <asm/machines.h>  /* Fun with Sun released architectures. */
  23
  24 /* Here is the master table of Sun machines which use some implementation
  25  * of the Sparc CPU and have a meaningful IDPROM machtype value that we
  26  * know about.  See asm-sparc/machines.h for empirical constants.
  27  */
  28 static struct Sun_Machine_Models Sun_Machines[NUM_SUN_MACHINES] = {
  29 /* First, Sun4's */
  30 { .name = "Sun 4/100 Series",        .id_machtype = (SM_SUN4 | SM_4_110) },
  31 { .name = "Sun 4/200 Series",        .id_machtype = (SM_SUN4 | SM_4_260) },
  32 { .name = "Sun 4/300 Series",        .id_machtype = (SM_SUN4 | SM_4_330) },
  33 { .name = "Sun 4/400 Series",        .id_machtype = (SM_SUN4 | SM_4_470) },
  34 /* Now, Sun4c's */
  35 { .name = "Sun4c SparcStation 1",    .id_machtype = (SM_SUN4C | SM_4C_SS1) },
  36 { .name = "Sun4c SparcStation IPC",  .id_machtype = (SM_SUN4C | SM_4C_IPC) },
  37 { .name = "Sun4c SparcStation 1+",   .id_machtype = (SM_SUN4C | SM_4C_SS1PLUS) },
  38 { .name = "Sun4c SparcStation SLC",  .id_machtype = (SM_SUN4C | SM_4C_SLC) },
  39 { .name = "Sun4c SparcStation 2",    .id_machtype = (SM_SUN4C | SM_4C_SS2) },
  40 { .name = "Sun4c SparcStation ELC",  .id_machtype = (SM_SUN4C | SM_4C_ELC) },
  41 { .name = "Sun4c SparcStation IPX",  .id_machtype = (SM_SUN4C | SM_4C_IPX) },
  42 /* Finally, early Sun4m's */
  43 { .name = "Sun4m SparcSystem600",    .id_machtype = (SM_SUN4M | SM_4M_SS60) },
  44 { .name = "Sun4m SparcStation10/20", .id_machtype = (SM_SUN4M | SM_4M_SS50) },
  45 { .name = "Sun4m SparcStation5",     .id_machtype = (SM_SUN4M | SM_4M_SS40) },
  46 /* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
  47 { .name = "Sun4M OBP based system",  .id_machtype = (SM_SUN4M_OBP | 0x0) } };
  48
  49 static void __init display_system_type(unsigned char machtype)
  50 {
  51         char sysname[128];
  52         register int i;
  53
  54         for (i = 0; i < NUM_SUN_MACHINES; i++) {
  55                 if (Sun_Machines[i].id_machtype == machtype) {
  56                         if (machtype != (SM_SUN4M_OBP | 0x00) ||
  57                             prom_getproperty(prom_root_node, "banner-name",
  58                                              sysname, sizeof(sysname)) <= 0)
  59                                 printk(KERN_WARNING "TYPE: %s\n",
  60                                        Sun_Machines[i].name);
  61                         else
  62                                 printk(KERN_WARNING "TYPE: %s\n", sysname);
  63                         return;
  64                 }
  65         }
  66
  67         prom_printf("IDPROM: Warning, bogus id_machtype value, 0x%x\n", machtype);
  68 }
  69 #else
  70 static void __init display_system_type(unsigned char machtype)
  71 {
  72 }
  73 #endif
  74 /* Calculate the IDPROM checksum (xor of the data bytes). */
  75 static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
  76 {
  77         unsigned char cksum, i, *ptr = (unsigned char *)idprom;
  78
  79         for (i = cksum = 0; i <= 0x0E; i++)
  80                 cksum ^= *ptr++;
  81
  82         return cksum;
  83 }
  84
  85 /* Create a local IDPROM copy, verify integrity, and display information. */
  86 void __init idprom_init(void)
  87 {
  88         prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
  89
  90         idprom = &idprom_buffer;
  91
  92         if (idprom->id_format != 0x01)
  93                 prom_printf("IDPROM: Warning, unknown format type!\n");
  94
  95         if (idprom->id_cksum != calc_idprom_cksum(idprom))
  96                 prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
  97                             idprom->id_cksum, calc_idprom_cksum(idprom));
  98
  99         display_system_type(idprom->id_machtype);
 100
 101         printk(KERN_WARNING "Ethernet address: %pM\n", idprom->id_ethaddr);
 102 }