1 /* $NetBSD: memory.c,v 1.9 2021/08/07 16:18:58 thorpej Exp $ */
2 /* $OpenBSD: mem.c,v 1.15 2007/10/14 17:29:04 kettenis Exp $ */
3
4 /*-
5 * Copyright (c) 1988 University of Utah.
6 * Copyright (c) 1982, 1986, 1990, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * the Systems Programming Group of the University of Utah Computer
11 * Science Department.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)mem.c 8.3 (Berkeley) 1/12/94
38 */
39
40 /*
41 * The EEPROMs for Serial Presence Detect don't show up in the
42 * OpenFirmware tree, but their contents are available through the
43 * "dimm-info" property of the "/memory" node. To make the
44 * information available, we fake up an I2C bus with EEPROMs
45 * containing the appropriate slices of the "dimm-info" property.
46 */
47
48 #include <sys/cdefs.h>
49 __KERNEL_RCSID(0, "$NetBSD: memory.c,v 1.9 2021/08/07 16:18:58 thorpej Exp $");
50
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/types.h>
54 #include <sys/malloc.h>
55 #include <sys/device.h>
56
57 #include <machine/autoconf.h>
58
59 #include <dev/i2c/i2cvar.h>
60 #include <dev/ofw/openfirm.h>
61
62 struct memory_softc {
63 device_t sc_dev;
64
65 u_char *sc_buf;
66 int sc_len;
67 };
68
69 /* Size of a single SPD entry in "dimm-info" property. */
70 #define SPD_SIZE 128
71
72 int memory_match(device_t, cfdata_t, void *);
73 void memory_attach(device_t, device_t, void *);
74
75 CFATTACH_DECL_NEW(memory, sizeof(struct memory_softc), memory_match, memory_attach,
76 NULL, NULL);
77
78 int memory_i2c_exec(void *, i2c_op_t, i2c_addr_t,
79 const void *, size_t, void *, size_t, int);
80
81 int
memory_match(device_t parent,cfdata_t cf,void * aux)82 memory_match(device_t parent, cfdata_t cf, void *aux)
83 {
84 struct confargs *ca = aux;
85
86 if (strcmp(ca->ca_name, "memory") == 0)
87 return (1);
88 return (0);
89 }
90
91 void
memory_attach(device_t parent,device_t self,void * aux)92 memory_attach(device_t parent, device_t self, void *aux)
93 {
94 struct memory_softc *sc = device_private(self);
95 struct confargs *ca = aux;
96 struct i2c_controller ic;
97 struct i2c_attach_args ia;
98
99 sc->sc_dev = self;
100 sc->sc_len = OF_getproplen(ca->ca_node, "dimm-info");
101 if (sc->sc_len > 0) {
102 sc->sc_buf = malloc(sc->sc_len, M_DEVBUF, M_WAITOK);
103 printf(": len=%d", sc->sc_len);
104 }
105
106 printf("\n");
107
108 if (sc->sc_len > 0) {
109 int addr;
110
111 OF_getprop(ca->ca_node, "dimm-info", sc->sc_buf, sc->sc_len);
112
113 iic_tag_init(&ic);
114 ic.ic_cookie = sc;
115 ic.ic_exec = memory_i2c_exec;
116
117 memset(&ia, 0, sizeof ia);
118 ia.ia_tag = ⁣
119 #ifdef notyet
120 ia.ia_name = "spd";
121 #endif
122 addr = 0;
123 while ((addr * SPD_SIZE) < sc->sc_len) {
124 /* Skip entries that have not been filled in. */
125 if (sc->sc_buf[addr * SPD_SIZE] != 0) {
126 ia.ia_addr = 0x50 + addr;
127 config_found(self, &ia, NULL, CFARGS_NONE);
128 }
129 addr++;
130 }
131
132 /* No need to keep the "dimm-info" contents around. */
133 free(sc->sc_buf, M_DEVBUF);
134 sc->sc_len = -1;
135 iic_tag_fini(&ic);
136 }
137 }
138
139 int
memory_i2c_exec(void * cookie,i2c_op_t op,i2c_addr_t addr,const void * cmdbuf,size_t cmdlen,void * buf,size_t len,int flags)140 memory_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr,
141 const void *cmdbuf, size_t cmdlen,
142 void *buf, size_t len, int flags)
143 {
144 struct memory_softc *sc = cookie;
145 size_t off;
146
147 if (op != I2C_OP_READ_WITH_STOP || cmdlen != 1)
148 return (EINVAL);
149
150 off = (addr - 0x50) * SPD_SIZE + *(const u_char *)cmdbuf;
151 if ((off + len) > sc->sc_len)
152 return (EIO);
153
154 memcpy(buf, &sc->sc_buf[off], len);
155 return (0);
156 }
157