LXR linux/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
  18struct idprom *idprom;
  19EXPORT_SYMBOL(idprom);
  20
  21static 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 */
  30static 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
  40static 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
  61static void __init display_system_type(unsigned char machtype)
  62{
  63}
  64#endif
  65
  66unsigned 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). */
  72static 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. */
  83void __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}
 100