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
  12 #include <asm/oplib.h>
  13 #include <asm/idprom.h>
  14 #include <asm/machines.h>  /* Fun with Sun released architectures. */
  15
  16 struct idprom *idprom;
  17 static struct idprom idprom_buffer;
  18
  19 /* Here is the master table of Sun machines which use some implementation
  20  * of the Sparc CPU and have a meaningful IDPROM machtype value that we
  21  * know about.  See asm-sparc/machines.h for empirical constants.
  22  */
  23 static struct Sun_Machine_Models Sun_Machines[NUM_SUN_MACHINES] = {
  24 /* First, Sun4's */
  25 { "Sun 4/100 Series", (SM_SUN4 | SM_4_110) },
  26 { "Sun 4/200 Series", (SM_SUN4 | SM_4_260) },
  27 { "Sun 4/300 Series", (SM_SUN4 | SM_4_330) },
  28 { "Sun 4/400 Series", (SM_SUN4 | SM_4_470) },
  29 /* Now, Sun4c's */
  30 { "Sun4c SparcStation 1", (SM_SUN4C | SM_4C_SS1) },
  31 { "Sun4c SparcStation IPC", (SM_SUN4C | SM_4C_IPC) },
  32 { "Sun4c SparcStation 1+", (SM_SUN4C | SM_4C_SS1PLUS) },
  33 { "Sun4c SparcStation SLC", (SM_SUN4C | SM_4C_SLC) },
  34 { "Sun4c SparcStation 2", (SM_SUN4C | SM_4C_SS2) },
  35 { "Sun4c SparcStation ELC", (SM_SUN4C | SM_4C_ELC) },
  36 { "Sun4c SparcStation IPX", (SM_SUN4C | SM_4C_IPX) },
  37 /* Finally, early Sun4m's */
  38 { "Sun4m SparcSystem600", (SM_SUN4M | SM_4M_SS60) },
  39 { "Sun4m SparcStation10/20", (SM_SUN4M | SM_4M_SS50) },
  40 { "Sun4m SparcStation5", (SM_SUN4M | SM_4M_SS40) },
  41 /* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
  42 { "Sun4M OBP based system", (SM_SUN4M_OBP | 0x0) } };
  43
  44 static void __init display_system_type(unsigned char machtype)
  45 {
  46         char sysname[128];
  47         register int i;
  48
  49         for (i = 0; i < NUM_SUN_MACHINES; i++) {
  50                 if(Sun_Machines[i].id_machtype == machtype) {
  51                         if (machtype != (SM_SUN4M_OBP | 0x00) ||
  52                             prom_getproperty(prom_root_node, "banner-name",
  53                                              sysname, sizeof(sysname)) <= 0)
  54                                 printk("TYPE: %s\n", Sun_Machines[i].name);
  55                         else
  56                                 printk("TYPE: %s\n", sysname);
  57                         return;
  58                 }
  59         }
  60
  61         prom_printf("IDPROM: Bogus id_machtype value, 0x%x\n", machtype);
  62         prom_halt();
  63 }
  64
  65 /* Calculate the IDPROM checksum (xor of the data bytes). */
  66 static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
  67 {
  68         unsigned char cksum, i, *ptr = (unsigned char *)idprom;
  69
  70         for (i = cksum = 0; i <= 0x0E; i++)
  71                 cksum ^= *ptr++;
  72
  73         return cksum;
  74 }
  75
  76 /* Create a local IDPROM copy, verify integrity, and display information. */
  77 void __init idprom_init(void)
  78 {
  79         prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
  80
  81         idprom = &idprom_buffer;
  82
  83         if (idprom->id_format != 0x01)  {
  84                 prom_printf("IDPROM: Unknown format type!\n");
  85                 prom_halt();
  86         }
  87
  88         if (idprom->id_cksum != calc_idprom_cksum(idprom)) {
  89                 prom_printf("IDPROM: Checksum failure (nvram=%x, calc=%x)!\n",
  90                             idprom->id_cksum, calc_idprom_cksum(idprom));
  91                 prom_halt();
  92         }
  93
  94         display_system_type(idprom->id_machtype);
  95
  96         printk("Ethernet address: %x:%x:%x:%x:%x:%x\n",
  97                     idprom->id_ethaddr[0], idprom->id_ethaddr[1],
  98                     idprom->id_ethaddr[2], idprom->id_ethaddr[3],
  99                     idprom->id_ethaddr[4], idprom->id_ethaddr[5]);
 100 }