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idprom.c

/* $Id: idprom.c,v 1.24 1999/08/31 06:54:20 davem Exp $
 * idprom.c: Routines to load the idprom into kernel addresses and
 *           interpret the data contained within.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>

#include <asm/oplib.h>
#include <asm/idprom.h>
#include <asm/machines.h>  /* Fun with Sun released architectures. */
#ifdef CONFIG_SUN4
#include <asm/sun4paddr.h>
extern void sun4setup(void);
#endif

struct idprom *idprom;
static struct idprom idprom_buffer;

/* Here is the master table of Sun machines which use some implementation
 * of the Sparc CPU and have a meaningful IDPROM machtype value that we
 * know about.  See asm-sparc/machines.h for empirical constants.
 */
struct Sun_Machine_Models Sun_Machines[NUM_SUN_MACHINES] = {
/* First, Sun4's */
{ "Sun 4/100 Series", (SM_SUN4 | SM_4_110) },
{ "Sun 4/200 Series", (SM_SUN4 | SM_4_260) },
{ "Sun 4/300 Series", (SM_SUN4 | SM_4_330) },
{ "Sun 4/400 Series", (SM_SUN4 | SM_4_470) },
/* Now, Sun4c's */
{ "Sun4c SparcStation 1", (SM_SUN4C | SM_4C_SS1) },
{ "Sun4c SparcStation IPC", (SM_SUN4C | SM_4C_IPC) },
{ "Sun4c SparcStation 1+", (SM_SUN4C | SM_4C_SS1PLUS) },
{ "Sun4c SparcStation SLC", (SM_SUN4C | SM_4C_SLC) },
{ "Sun4c SparcStation 2", (SM_SUN4C | SM_4C_SS2) },
{ "Sun4c SparcStation ELC", (SM_SUN4C | SM_4C_ELC) },
{ "Sun4c SparcStation IPX", (SM_SUN4C | SM_4C_IPX) },
/* Finally, early Sun4m's */
{ "Sun4m SparcSystem600", (SM_SUN4M | SM_4M_SS60) },
{ "Sun4m SparcStation10/20", (SM_SUN4M | SM_4M_SS50) },
{ "Sun4m SparcStation5", (SM_SUN4M | SM_4M_SS40) },
/* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
{ "Sun4M OBP based system", (SM_SUN4M_OBP | 0x0) } };

static void __init display_system_type(unsigned char machtype)
{
      char sysname[128];
      register int i;

      for (i = 0; i < NUM_SUN_MACHINES; i++) {
            if(Sun_Machines[i].id_machtype == machtype) {
                  if (machtype != (SM_SUN4M_OBP | 0x00) ||
                      prom_getproperty(prom_root_node, "banner-name",
                                   sysname, sizeof(sysname)) <= 0)
                        printk("TYPE: %s\n", Sun_Machines[i].name);
                  else
                        printk("TYPE: %s\n", sysname);
                  return;
            }
      }

      prom_printf("IDPROM: Bogus id_machtype value, 0x%x\n", machtype);
      prom_halt();
}

/* Calculate the IDPROM checksum (xor of the data bytes). */
static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
{
      unsigned char cksum, i, *ptr = (unsigned char *)idprom;

      for (i = cksum = 0; i <= 0x0E; i++)
            cksum ^= *ptr++;

      return cksum;
}

/* Create a local IDPROM copy, verify integrity, and display information. */
void __init idprom_init(void)
{
      prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));

      idprom = &idprom_buffer;

      if (idprom->id_format != 0x01)  {
            prom_printf("IDPROM: Unknown format type!\n");
            prom_halt();
      }

      if (idprom->id_cksum != calc_idprom_cksum(idprom)) {
            prom_printf("IDPROM: Checksum failure (nvram=%x, calc=%x)!\n",
                      idprom->id_cksum, calc_idprom_cksum(idprom));
            prom_halt();
      }

      display_system_type(idprom->id_machtype);

      printk("Ethernet address: %x:%x:%x:%x:%x:%x\n",
                idprom->id_ethaddr[0], idprom->id_ethaddr[1],
                idprom->id_ethaddr[2], idprom->id_ethaddr[3],
                idprom->id_ethaddr[4], idprom->id_ethaddr[5]);
#ifdef CONFIG_SUN4
      sun4setup();
#endif
}

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