1 /* $NetBSD: eeprom.c,v 1.10 2021/01/24 07:36:54 mrg Exp $ */
2
3 /*-
4 * Copyright (c) 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Paul Kranenburg.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * eeprom driver. Sun 4 machines use the old-style (a'la Sun 3) EEPROM.
34 * On the 4/100's and 4/200's, this is at a separate obio space.
35 * On the 4/300's and 4/400's, however, it is the cl_nvram[] chunk of
36 * the Mostek chip. Therefore, eeprom_match will only return true on
37 * the 100/200 models, and the eeprom will be attached separately.
38 * On the 300/400 models, the eeprom will be dealt with when the clock
39 * is attached.
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: eeprom.c,v 1.10 2021/01/24 07:36:54 mrg Exp $");
44
45 #include "opt_sparc_arch.h"
46
47 #include <sys/param.h>
48 #include <sys/kernel.h>
49 #include <sys/device.h>
50 #include <sys/systm.h>
51
52 #include <sys/bus.h>
53 #include <machine/autoconf.h>
54 #include <machine/eeprom.h>
55
56 #include <dev/clock_subr.h>
57
58 static int eeprom_match(device_t, cfdata_t, void *);
59 static void eeprom_attach(device_t, device_t, void *);
60
61 CFATTACH_DECL_NEW(eeprom, 0,
62 eeprom_match, eeprom_attach, NULL, NULL);
63
64 /* We support only one eeprom device */
65 static int eeprom_attached;
66
67 /*
68 * Sun 4/100, 4/200 EEPROM match routine.
69 */
70 static int
eeprom_match(device_t parent,cfdata_t cf,void * aux)71 eeprom_match(device_t parent, cfdata_t cf, void *aux)
72 {
73 union obio_attach_args *uoba = aux;
74 struct obio4_attach_args *oba;
75
76 if (uoba->uoba_isobio4 == 0)
77 return (0);
78
79 if (eeprom_attached)
80 /* We support only one eeprom device */
81 return (0);
82
83 /* Only these sun4s have oclock */
84 if (!CPU_ISSUN4 ||
85 (cpuinfo.cpu_type != CPUTYP_4_100 &&
86 cpuinfo.cpu_type != CPUTYP_4_200))
87 return (0);
88
89 /* Make sure there is something there */
90 oba = &uoba->uoba_oba4;
91 return (bus_space_probe(oba->oba_bustag, oba->oba_paddr,
92 1, /* probe size */
93 0, /* offset */
94 0, /* flags */
95 NULL, NULL));
96 }
97
98 static void
eeprom_attach(device_t parent,device_t self,void * aux)99 eeprom_attach(device_t parent, device_t self, void *aux)
100 {
101 #if defined(SUN4)
102 union obio_attach_args *uoba = aux;
103 struct obio4_attach_args *oba = &uoba->uoba_oba4;
104 bus_space_handle_t bh;
105
106 eeprom_attached = 1;
107 printf("\n");
108
109 if (bus_space_map(oba->oba_bustag,
110 oba->oba_paddr,
111 EEPROM_SIZE,
112 BUS_SPACE_MAP_LINEAR, /* flags */
113 &bh) != 0) {
114 printf("%s: can't map register\n",
115 device_xname(self));
116 return;
117 }
118 eeprom_va = (char *)bh;
119 #endif /* SUN4 */
120 }
121