1/*	$NetBSD: memory.c,v 1.4 2011/06/18 08:08:28 matt 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 1.4 2011/06/18 08:08:28 matt 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
62struct 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
72int	memory_match(device_t, cfdata_t, void *);
73void	memory_attach(device_t, device_t, void *);
74
75CFATTACH_DECL_NEW(memory, sizeof(struct memory_softc), memory_match, memory_attach,
76              NULL, NULL);
77
78int	memory_i2c_acquire_bus(void *, int);
79void	memory_i2c_release_bus(void *, int);
80int	memory_i2c_exec(void *, i2c_op_t, i2c_addr_t,
81   	                const void *, size_t, void *, size_t, int);
82
83int
84memory_match(device_t parent, cfdata_t cf, void *aux)
85{
86	struct confargs *ca = aux;
87
88	if (strcmp(ca->ca_name, "memory") == 0)
89		return (1);
90	return (0);
91}
92
93void
94memory_attach(device_t parent, device_t self, void *aux)
95{
96	struct memory_softc *sc = device_private(self);
97	struct confargs *ca = aux;
98	struct i2c_controller ic;
99	struct i2c_attach_args ia;
100
101	sc->sc_dev = self;
102	sc->sc_len = OF_getproplen(ca->ca_node, "dimm-info");
103	if (sc->sc_len > 0) {
104		sc->sc_buf = malloc(sc->sc_len, M_DEVBUF, M_NOWAIT);
105		if (sc->sc_buf == NULL) {
106			printf(": can't allocate memory\n");
107			return;
108		}
109		printf(": len=%d", sc->sc_len);
110	}
111
112	printf("\n");
113
114	if (sc->sc_len > 0) {
115		int	addr;
116
117		OF_getprop(ca->ca_node, "dimm-info", sc->sc_buf, sc->sc_len);
118
119		memset(&ic, 0, sizeof ic);
120		ic.ic_cookie = sc;
121		ic.ic_acquire_bus = memory_i2c_acquire_bus;
122		ic.ic_release_bus = memory_i2c_release_bus;
123		ic.ic_exec = memory_i2c_exec;
124
125		memset(&ia, 0, sizeof ia);
126		ia.ia_tag = &ic;
127#ifdef notyet
128		ia.ia_name = "spd";
129#endif
130		addr = 0;
131		while ((addr * SPD_SIZE) < sc->sc_len) {
132			/* Skip entries that have not been filled in. */
133			if (sc->sc_buf[addr * SPD_SIZE] != 0) {
134				ia.ia_addr = 0x50 + addr;
135				config_found(self, &ia, NULL);
136			}
137			addr++;
138		}
139
140		/* No need to keep the "dimm-info" contents around. */
141		free(sc->sc_buf, M_DEVBUF);
142		sc->sc_len = -1;
143	}
144}
145
146int
147memory_i2c_acquire_bus(void *cookie, int flags)
148{
149	return (0);
150}
151
152void
153memory_i2c_release_bus(void *cookie, int flags)
154{
155}
156
157int
158memory_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr,
159                const void *cmdbuf, size_t cmdlen,
160		void *buf, size_t len, int flags)
161{
162	struct memory_softc *sc = cookie;
163	size_t off;
164
165	if (op != I2C_OP_READ_WITH_STOP || cmdlen != 1)
166		return (EINVAL);
167
168	off = (addr - 0x50) * SPD_SIZE + *(const u_char *)cmdbuf;
169	if ((off + len) > sc->sc_len)
170		return (EIO);
171
172	memcpy(buf, &sc->sc_buf[off], len);
173	return (0);
174}
175
176
177