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
  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[] = {
  29 /* First, Leon */
  30 { .name = "Leon3 System-on-a-Chip",  .id_machtype = (M_LEON | M_LEON3_SOC) },
  31 /* Finally, early Sun4m's */
  32 { .name = "Sun4m SparcSystem600",    .id_machtype = (SM_SUN4M | SM_4M_SS60) },
  33 { .name = "Sun4m SparcStation10/20", .id_machtype = (SM_SUN4M | SM_4M_SS50) },
  34 { .name = "Sun4m SparcStation5",     .id_machtype = (SM_SUN4M | SM_4M_SS40) },
  35 /* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
  36 { .name = "Sun4M OBP based system",  .id_machtype = (SM_SUN4M_OBP | 0x0) } };
  37
  38 static void __init display_system_type(unsigned char machtype)
  39 {
  40         char sysname[128];
  41         register int i;
  42
  43         for (i = 0; i < ARRAY_SIZE(Sun_Machines); i++) {
  44                 if (Sun_Machines[i].id_machtype == machtype) {
  45                         if (machtype != (SM_SUN4M_OBP | 0x00) ||
  46                             prom_getproperty(prom_root_node, "banner-name",
  47                                              sysname, sizeof(sysname)) <= 0)
  48                                 printk(KERN_WARNING "TYPE: %s\n",
  49                                        Sun_Machines[i].name);
  50                         else
  51                                 printk(KERN_WARNING "TYPE: %s\n", sysname);
  52                         return;
  53                 }
  54         }
  55
  56         prom_printf("IDPROM: Warning, bogus id_machtype value, 0x%x\n", machtype);
  57 }
  58 #else
  59 static void __init display_system_type(unsigned char machtype)
  60 {
  61 }
  62 #endif
  63 /* Calculate the IDPROM checksum (xor of the data bytes). */
  64 static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
  65 {
  66         unsigned char cksum, i, *ptr = (unsigned char *)idprom;
  67
  68         for (i = cksum = 0; i <= 0x0E; i++)
  69                 cksum ^= *ptr++;
  70
  71         return cksum;
  72 }
  73
  74 /* Create a local IDPROM copy, verify integrity, and display information. */
  75 void __init idprom_init(void)
  76 {
  77         prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
  78
  79         idprom = &idprom_buffer;
  80
  81         if (idprom->id_format != 0x01)
  82                 prom_printf("IDPROM: Warning, unknown format type!\n");
  83
  84         if (idprom->id_cksum != calc_idprom_cksum(idprom))
  85                 prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
  86                             idprom->id_cksum, calc_idprom_cksum(idprom));
  87
  88         display_system_type(idprom->id_machtype);
  89
  90         printk(KERN_WARNING "Ethernet address: %pM\n", idprom->id_ethaddr);
  91 }