xref: /openbmc/qemu/hw/tpm/tpm_tis_sysbus.c (revision 2b74dd91)
1 /*
2  * tpm_tis_sysbus.c - QEMU's TPM TIS SYSBUS Device
3  *
4  * Copyright (C) 2006,2010-2013 IBM Corporation
5  *
6  * Authors:
7  *  Stefan Berger <stefanb@us.ibm.com>
8  *  David Safford <safford@us.ibm.com>
9  *
10  * Xen 4 support: Andrease Niederl <andreas.niederl@iaik.tugraz.at>
11  *
12  * This work is licensed under the terms of the GNU GPL, version 2 or later.
13  * See the COPYING file in the top-level directory.
14  *
15  * Implementation of the TIS interface according to specs found at
16  * http://www.trustedcomputinggroup.org. This implementation currently
17  * supports version 1.3, 21 March 2013
18  * In the developers menu choose the PC Client section then find the TIS
19  * specification.
20  *
21  * TPM TIS for TPM 2 implementation following TCG PC Client Platform
22  * TPM Profile (PTP) Specification, Family 2.0, Revision 00.43
23  */
24 
25 #include "qemu/osdep.h"
26 #include "hw/qdev-properties.h"
27 #include "migration/vmstate.h"
28 #include "hw/acpi/tpm.h"
29 #include "tpm_prop.h"
30 #include "hw/sysbus.h"
31 #include "tpm_tis.h"
32 #include "qom/object.h"
33 
34 struct TPMStateSysBus {
35     /*< private >*/
36     SysBusDevice parent_obj;
37 
38     /*< public >*/
39     TPMState state; /* not a QOM object */
40 };
41 
42 OBJECT_DECLARE_SIMPLE_TYPE(TPMStateSysBus, TPM_TIS_SYSBUS)
43 
44 static int tpm_tis_pre_save_sysbus(void *opaque)
45 {
46     TPMStateSysBus *sbdev = opaque;
47 
48     return tpm_tis_pre_save(&sbdev->state);
49 }
50 
51 static const VMStateDescription vmstate_tpm_tis_sysbus = {
52     .name = "tpm-tis",
53     .version_id = 0,
54     .pre_save  = tpm_tis_pre_save_sysbus,
55     .fields = (const VMStateField[]) {
56         VMSTATE_BUFFER(state.buffer, TPMStateSysBus),
57         VMSTATE_UINT16(state.rw_offset, TPMStateSysBus),
58         VMSTATE_UINT8(state.active_locty, TPMStateSysBus),
59         VMSTATE_UINT8(state.aborting_locty, TPMStateSysBus),
60         VMSTATE_UINT8(state.next_locty, TPMStateSysBus),
61 
62         VMSTATE_STRUCT_ARRAY(state.loc, TPMStateSysBus, TPM_TIS_NUM_LOCALITIES,
63                              0, vmstate_locty, TPMLocality),
64 
65         VMSTATE_END_OF_LIST()
66     }
67 };
68 
69 static void tpm_tis_sysbus_request_completed(TPMIf *ti, int ret)
70 {
71     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
72     TPMState *s = &sbdev->state;
73 
74     tpm_tis_request_completed(s, ret);
75 }
76 
77 static enum TPMVersion tpm_tis_sysbus_get_tpm_version(TPMIf *ti)
78 {
79     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
80     TPMState *s = &sbdev->state;
81 
82     return tpm_tis_get_tpm_version(s);
83 }
84 
85 static void tpm_tis_sysbus_reset(DeviceState *dev)
86 {
87     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
88     TPMState *s = &sbdev->state;
89 
90     return tpm_tis_reset(s);
91 }
92 
93 static Property tpm_tis_sysbus_properties[] = {
94     DEFINE_PROP_UINT32("irq", TPMStateSysBus, state.irq_num, TPM_TIS_IRQ),
95     DEFINE_PROP_TPMBE("tpmdev", TPMStateSysBus, state.be_driver),
96     DEFINE_PROP_END_OF_LIST(),
97 };
98 
99 static void tpm_tis_sysbus_initfn(Object *obj)
100 {
101     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(obj);
102     TPMState *s = &sbdev->state;
103 
104     memory_region_init_io(&s->mmio, obj, &tpm_tis_memory_ops,
105                           s, "tpm-tis-mmio",
106                           TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT);
107 
108     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
109     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
110 }
111 
112 static void tpm_tis_sysbus_realizefn(DeviceState *dev, Error **errp)
113 {
114     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
115     TPMState *s = &sbdev->state;
116 
117     if (!tpm_find()) {
118         error_setg(errp, "at most one TPM device is permitted");
119         return;
120     }
121 
122     if (!s->be_driver) {
123         error_setg(errp, "'tpmdev' property is required");
124         return;
125     }
126 }
127 
128 static void tpm_tis_sysbus_class_init(ObjectClass *klass, void *data)
129 {
130     DeviceClass *dc = DEVICE_CLASS(klass);
131     TPMIfClass *tc = TPM_IF_CLASS(klass);
132 
133     device_class_set_props(dc, tpm_tis_sysbus_properties);
134     dc->vmsd  = &vmstate_tpm_tis_sysbus;
135     tc->model = TPM_MODEL_TPM_TIS;
136     dc->realize = tpm_tis_sysbus_realizefn;
137     dc->user_creatable = true;
138     device_class_set_legacy_reset(dc, tpm_tis_sysbus_reset);
139     tc->request_completed = tpm_tis_sysbus_request_completed;
140     tc->get_version = tpm_tis_sysbus_get_tpm_version;
141     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
142 }
143 
144 static const TypeInfo tpm_tis_sysbus_info = {
145     .name = TYPE_TPM_TIS_SYSBUS,
146     .parent = TYPE_SYS_BUS_DEVICE,
147     .instance_size = sizeof(TPMStateSysBus),
148     .instance_init = tpm_tis_sysbus_initfn,
149     .class_init  = tpm_tis_sysbus_class_init,
150     .interfaces = (InterfaceInfo[]) {
151         { TYPE_TPM_IF },
152         { }
153     }
154 };
155 
156 static void tpm_tis_sysbus_register(void)
157 {
158     type_register_static(&tpm_tis_sysbus_info);
159 }
160 
161 type_init(tpm_tis_sysbus_register)
162