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