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 * Sun3/3x models added by David Monro (davidm@psrg.cs.usyd.edu.au)
  8 */
  9
 10#include <linux/module.h>
 11#include <linux/kernel.h>
 12#include <linux/types.h>
 13#include <linux/init.h>
 14#include <linux/string.h>
 15
 16#include <asm/oplib.h>
 17#include <asm/idprom.h>
 18#include <asm/machines.h>  /* Fun with Sun released architectures. */
 19
 20#include "sun3.h"
 21
 22struct idprom *idprom;
 23EXPORT_SYMBOL(idprom);
 24
 25static struct idprom idprom_buffer;
 26
 27/* Here is the master table of Sun machines which use some implementation
 28 * of the Sparc CPU and have a meaningful IDPROM machtype value that we
 29 * know about.  See asm-sparc/machines.h for empirical constants.
 30 */
 31static struct Sun_Machine_Models Sun_Machines[NUM_SUN_MACHINES] = {
 32/* First, Sun3's */
 33    { .name = "Sun 3/160 Series",	.id_machtype = (SM_SUN3 | SM_3_160) },
 34    { .name = "Sun 3/50",		.id_machtype = (SM_SUN3 | SM_3_50) },
 35    { .name = "Sun 3/260 Series",	.id_machtype = (SM_SUN3 | SM_3_260) },
 36    { .name = "Sun 3/110 Series",	.id_machtype = (SM_SUN3 | SM_3_110) },
 37    { .name = "Sun 3/60",		.id_machtype = (SM_SUN3 | SM_3_60) },
 38    { .name = "Sun 3/E",		.id_machtype = (SM_SUN3 | SM_3_E) },
 39/* Now, Sun3x's */
 40    { .name = "Sun 3/460 Series",	.id_machtype = (SM_SUN3X | SM_3_460) },
 41    { .name = "Sun 3/80",		.id_machtype = (SM_SUN3X | SM_3_80) },
 42/* Then, Sun4's */
 43// { .name = "Sun 4/100 Series",	.id_machtype = (SM_SUN4 | SM_4_110) },
 44// { .name = "Sun 4/200 Series",	.id_machtype = (SM_SUN4 | SM_4_260) },
 45// { .name = "Sun 4/300 Series",	.id_machtype = (SM_SUN4 | SM_4_330) },
 46// { .name = "Sun 4/400 Series",	.id_machtype = (SM_SUN4 | SM_4_470) },
 47/* And now, Sun4c's */
 48// { .name = "Sun4c SparcStation 1",	.id_machtype = (SM_SUN4C | SM_4C_SS1) },
 49// { .name = "Sun4c SparcStation IPC",	.id_machtype = (SM_SUN4C | SM_4C_IPC) },
 50// { .name = "Sun4c SparcStation 1+",	.id_machtype = (SM_SUN4C | SM_4C_SS1PLUS) },
 51// { .name = "Sun4c SparcStation SLC",	.id_machtype = (SM_SUN4C | SM_4C_SLC) },
 52// { .name = "Sun4c SparcStation 2",	.id_machtype = (SM_SUN4C | SM_4C_SS2) },
 53// { .name = "Sun4c SparcStation ELC",	.id_machtype = (SM_SUN4C | SM_4C_ELC) },
 54// { .name = "Sun4c SparcStation IPX",	.id_machtype = (SM_SUN4C | SM_4C_IPX) },
 55/* Finally, early Sun4m's */
 56// { .name = "Sun4m SparcSystem600",	.id_machtype = (SM_SUN4M | SM_4M_SS60) },
 57// { .name = "Sun4m SparcStation10/20",	.id_machtype = (SM_SUN4M | SM_4M_SS50) },
 58// { .name = "Sun4m SparcStation5",	.id_machtype = (SM_SUN4M | SM_4M_SS40) },
 59/* One entry for the OBP arch's which are sun4d, sun4e, and newer sun4m's */
 60// { .name = "Sun4M OBP based system",	.id_machtype = (SM_SUN4M_OBP | 0x0) }
 61};
 62
 63static void __init display_system_type(unsigned char machtype)
 64{
 65	register int i;
 66
 67	for (i = 0; i < NUM_SUN_MACHINES; i++) {
 68		if(Sun_Machines[i].id_machtype == machtype) {
 69			if (machtype != (SM_SUN4M_OBP | 0x00))
 70				pr_info("TYPE: %s\n", Sun_Machines[i].name);
 71			else {
 72#if 0
 73				char sysname[128];
 74
 75				prom_getproperty(prom_root_node, "banner-name",
 76						 sysname, sizeof(sysname));
 77				pr_info("TYPE: %s\n", sysname);
 78#endif
 79			}
 80			return;
 81		}
 82	}
 83
 84	prom_printf("IDPROM: Bogus id_machtype value, 0x%x\n", machtype);
 85	prom_halt();
 86}
 87
 88void sun3_get_model(char *model)
 89{
 90	register int i;
 91
 92	for (i = 0; i < NUM_SUN_MACHINES; i++) {
 93		if(Sun_Machines[i].id_machtype == idprom->id_machtype) {
 94		        strcpy(model, Sun_Machines[i].name);
 95			return;
 96		}
 97	}
 98}
 99
100
101
102/* Calculate the IDPROM checksum (xor of the data bytes). */
103static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
104{
105	unsigned char cksum, i, *ptr = (unsigned char *)idprom;
106
107	for (i = cksum = 0; i <= 0x0E; i++)
108		cksum ^= *ptr++;
109
110	return cksum;
111}
112
113/* Create a local IDPROM copy, verify integrity, and display information. */
114void __init idprom_init(void)
115{
116	prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
117
118	idprom = &idprom_buffer;
119
120	if (idprom->id_format != 0x01)  {
121		prom_printf("IDPROM: Unknown format type!\n");
122		prom_halt();
123	}
124
125	if (idprom->id_cksum != calc_idprom_cksum(idprom)) {
126		prom_printf("IDPROM: Checksum failure (nvram=%x, calc=%x)!\n",
127			    idprom->id_cksum, calc_idprom_cksum(idprom));
128		prom_halt();
129	}
130
131	display_system_type(idprom->id_machtype);
132
133	pr_info("Ethernet address: %pM\n", idprom->id_ethaddr);
134}