tpm_acpi.c revision 1.8 
1/* $NetBSD: tpm_acpi.c,v 1.8 2019/06/22 12:57:40 maxv Exp $ */
2
3/*
4 * Copyright (c) 2012, 2019 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas and Maxime Villard.
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#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: tpm_acpi.c,v 1.8 2019/06/22 12:57:40 maxv Exp $");
34
35#include <sys/param.h>
36#include <sys/device.h>
37#include <sys/systm.h>
38#include <sys/device.h>
39#include <sys/bus.h>
40#include <sys/pmf.h>
41
42#include <dev/ic/tpmreg.h>
43#include <dev/ic/tpmvar.h>
44
45#include <dev/acpi/acpireg.h>
46#include <dev/acpi/acpivar.h>
47
48#include <dev/isa/isavar.h>
49
50#include "ioconf.h"
51
52#define _COMPONENT	ACPI_RESOURCE_COMPONENT
53ACPI_MODULE_NAME	("tpm_acpi")
54
55static int	tpm_acpi_match(device_t, cfdata_t, void *);
56static void	tpm_acpi_attach(device_t, device_t, void *);
57
58CFATTACH_DECL_NEW(tpm_acpi, sizeof(struct tpm_softc), tpm_acpi_match,
59    tpm_acpi_attach, NULL, NULL);
60
61/*
62 * Supported TPM 2.0 devices.
63 */
64static const char * const tpm2_acpi_ids[] = {
65	"MSFT0101",
66	NULL
67};
68
69static int
70tpm_acpi_match(device_t parent, cfdata_t match, void *aux)
71{
72	struct acpi_attach_args *aa = aux;
73	ACPI_TABLE_TPM2 *tpm2;
74	ACPI_STATUS rv;
75
76	if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
77		return 0;
78
79	/* We support only one TPM. */
80	if (tpm_cd.cd_devs && tpm_cd.cd_devs[0])
81		return 0;
82
83	if (!acpi_match_hid(aa->aa_node->ad_devinfo, tpm2_acpi_ids))
84		return 0;
85
86	/* Make sure it uses TIS, and not CRB. */
87	rv = AcpiGetTable(ACPI_SIG_TPM2, 1, (ACPI_TABLE_HEADER **)&tpm2);
88	if (ACPI_FAILURE(rv))
89		return 0;
90	if (tpm2->StartMethod != ACPI_TPM2_MEMORY_MAPPED)
91		return 0;
92
93	return 1;
94}
95
96static void
97tpm_acpi_attach(device_t parent, device_t self, void *aux)
98{
99	struct tpm_softc *sc = device_private(self);
100	struct acpi_attach_args *aa = aux;
101	struct acpi_resources res;
102	struct acpi_mem *mem;
103	struct acpi_irq *irq;
104	bus_addr_t base;
105	bus_addr_t size;
106	int rv, inum;
107
108	sc->sc_dev = self;
109	sc->sc_ver = TPM_2_0;
110
111	rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", &res,
112	    &acpi_resource_parse_ops_default);
113	if (ACPI_FAILURE(rv)) {
114		aprint_error_dev(sc->sc_dev, "cannot parse resources %d\n", rv);
115		return;
116	}
117
118	mem = acpi_res_mem(&res, 0);
119	if (mem == NULL) {
120		aprint_error_dev(sc->sc_dev, "cannot find mem\n");
121		goto out;
122	}
123	if (mem->ar_length != TPM_SPACE_SIZE) {
124		aprint_error_dev(sc->sc_dev,
125		    "wrong size mem %"PRIu64" != %u\n",
126		    (uint64_t)mem->ar_length, TPM_SPACE_SIZE);
127		goto out;
128	}
129
130	base = mem->ar_base;
131	size = mem->ar_length;
132	sc->sc_bt = aa->aa_memt;
133	sc->sc_init = tpm_tis12_init;
134	sc->sc_start = tpm_tis12_start;
135	sc->sc_read = tpm_tis12_read;
136	sc->sc_write = tpm_tis12_write;
137	sc->sc_end = tpm_tis12_end;
138
139	if (bus_space_map(sc->sc_bt, base, size, 0, &sc->sc_bh)) {
140		aprint_error_dev(sc->sc_dev, "cannot map registers\n");
141		goto out;
142	}
143
144	if (!tpm_tis12_probe(sc->sc_bt, sc->sc_bh)) {
145		aprint_error_dev(sc->sc_dev, "TIS1.2 probe failed\n");
146		goto out1;
147	}
148
149	irq = acpi_res_irq(&res, 0);
150	if (irq == NULL)
151		inum = -1;
152	else
153		inum = irq->ar_irq;
154
155	if ((rv = (*sc->sc_init)(sc, inum)) != 0) {
156		aprint_error_dev(sc->sc_dev, "cannot init device %d\n", rv);
157		goto out1;
158	}
159
160	if (inum != -1 &&
161	    (sc->sc_ih = isa_intr_establish(aa->aa_ic, irq->ar_irq,
162	    IST_EDGE, IPL_TTY, tpm_intr, sc)) == NULL) {
163		aprint_error_dev(sc->sc_dev, "cannot establish interrupt\n");
164		goto out1;
165	}
166
167	acpi_resource_cleanup(&res);
168	return;
169
170out1:
171	bus_space_unmap(sc->sc_bt, sc->sc_bh, size);
172out:
173	acpi_resource_cleanup(&res);
174}
175