1/*	$NetBSD: ingenic_efuse.c,v 1.3 2015/10/14 15:44:57 macallan Exp $ */
2
3/*-
4 * Copyright (c) 2015 Michael Lorenz
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/*
30 * a driver for the 'EFUSE Slave Interface' found on JZ4780
31 * more or less 8kBit of non-volatile storage containing things like MAC
32 * address, various encryption keys, boot code, serial numbers and parameters.
33 * Using it only to get the MAC address for now.
34 */
35
36#include <sys/cdefs.h>
37__KERNEL_RCSID(0, "$NetBSD: ingenic_efuse.c,v 1.3 2015/10/14 15:44:57 macallan Exp $");
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/device.h>
42#include <sys/mutex.h>
43#include <sys/bus.h>
44
45#include <mips/ingenic/ingenic_var.h>
46#include <mips/ingenic/ingenic_regs.h>
47
48#include "opt_ingenic.h"
49
50static int ingenic_efuse_match(device_t, struct cfdata *, void *);
51static void ingenic_efuse_attach(device_t, device_t, void *);
52
53struct efuse_softc {
54	device_t		sc_dev;
55	bus_space_tag_t		sc_iot;
56	bus_space_handle_t	sc_ioh;
57	uint8_t			sc_data[0x20];
58};
59
60static void ingenic_efuse_read(struct efuse_softc *, int, int, uint8_t *);
61
62void ingenic_set_enaddr(uint8_t *);
63
64CFATTACH_DECL_NEW(ingenic_efuse, sizeof(struct efuse_softc),
65    ingenic_efuse_match, ingenic_efuse_attach, NULL, NULL);
66
67/* ARGSUSED */
68static int
69ingenic_efuse_match(device_t parent, struct cfdata *match, void *aux)
70{
71	struct apbus_attach_args *aa = aux;
72
73	if (strcmp(aa->aa_name, "efuse") != 0)
74		return 0;
75
76	return 1;
77}
78
79/* ARGSUSED */
80static void
81ingenic_efuse_attach(device_t parent, device_t self, void *aux)
82{
83	struct efuse_softc *sc = device_private(self);
84	struct apbus_attach_args *aa = aux;
85	int error;
86
87	sc->sc_dev = self;
88
89	sc->sc_iot = aa->aa_bst;
90
91	if (aa->aa_addr == 0)
92		aa->aa_addr = JZ_EFUSE;
93
94	error = bus_space_map(aa->aa_bst, aa->aa_addr, 0x30, 0, &sc->sc_ioh);
95	if (error) {
96		aprint_error_dev(self,
97		    "can't map registers for %s: %d\n", aa->aa_name, error);
98		return;
99	}
100
101	aprint_naive(": Ingenic EFUSE Slave Interface\n");
102	aprint_normal(": Ingenic EFUSE Slave Interface\n");
103	ingenic_efuse_read(sc, 8, 0x20, sc->sc_data);
104	ingenic_set_enaddr(&sc->sc_data[0x1a]);
105#ifdef INGENIC_DEBUG
106	{
107		int i, j;
108		for (i = 0; i < 0x20; i += 8) {
109			printf("%02x:", i);
110			for (j = 0; j < 8; j++)
111				printf(" %02x", sc->sc_data[i + j]);
112			printf("\n");
113		}
114	}
115#endif
116}
117
118static void
119ingenic_efuse_read(struct efuse_softc *sc, int addr, int len, uint8_t *buf)
120{
121	uint32_t abuf;
122	int i;
123
124	/* default, just in case */
125	bus_space_write_4(sc->sc_iot, sc->sc_ioh, JZ_EFUCFG, 0x00040000);
126	bus_space_write_4(sc->sc_iot, sc->sc_ioh, JZ_EFUCTRL,
127		JZ_EFUSE_READ |
128		(addr << JZ_EFUSE_ADDR_SHIFT) |
129		((len - 1) << JZ_EFUSE_SIZE_SHIFT));
130	do {} while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, JZ_EFUSTATE) &
131		JZ_EFUSE_RD_DONE) == 0);
132	for (i = 0; i < len; i += 4) {
133		abuf = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
134		    JZ_EFUDATA0 + i);
135		memcpy(buf, &abuf, 4);
136		buf += 4;
137	}
138}
139