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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/core/qdev-properties.h"
27 #include "migration/vmstate.h"
28 #include "hw/acpi/tpm.h"
29 #include "tpm_prop.h"
30 #include "hw/core/sysbus.h"
31 #include "tpm_tis.h"
32 #include "qom/object.h"
33 #include "qemu/memalign.h"
34
35 struct TPMStateSysBus {
36 /*< private >*/
37 SysBusDevice parent_obj;
38
39 /*< public >*/
40 TPMState state; /* not a QOM object */
41 };
42
43 OBJECT_DECLARE_SIMPLE_TYPE(TPMStateSysBus, TPM_TIS_SYSBUS)
44
45 static int tpm_tis_pre_save_sysbus(void *opaque)
46 {
47 TPMStateSysBus *sbdev = opaque;
48
49 return tpm_tis_pre_save(&sbdev->state);
50 }
51
52 static const VMStateDescription vmstate_tpm_tis_sysbus = {
53 .name = "tpm-tis",
54 .version_id = 0,
55 .pre_save = tpm_tis_pre_save_sysbus,
56 .fields = (const VMStateField[]) {
57 VMSTATE_BUFFER(state.buffer, TPMStateSysBus),
58 VMSTATE_UINT16(state.rw_offset, TPMStateSysBus),
59 VMSTATE_UINT8(state.active_locty, TPMStateSysBus),
60 VMSTATE_UINT8(state.aborting_locty, TPMStateSysBus),
61 VMSTATE_UINT8(state.next_locty, TPMStateSysBus),
62
63 VMSTATE_STRUCT_ARRAY(state.loc, TPMStateSysBus, TPM_TIS_NUM_LOCALITIES,
64 0, vmstate_locty, TPMLocality),
65
66 VMSTATE_END_OF_LIST()
67 }
68 };
69
70 static void tpm_tis_sysbus_request_completed(TPMIf *ti, int ret)
71 {
72 TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
73 TPMState *s = &sbdev->state;
74
75 tpm_tis_request_completed(s, ret);
76 }
77
78 static enum TPMVersion tpm_tis_sysbus_get_tpm_version(TPMIf *ti)
79 {
80 TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
81 TPMState *s = &sbdev->state;
82
83 return tpm_tis_get_tpm_version(s);
84 }
85
86 static void tpm_tis_sysbus_reset(DeviceState *dev)
87 {
88 TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
89 TPMState *s = &sbdev->state;
90
91 return tpm_tis_reset(s, false);
92 }
93
94 static const Property tpm_tis_sysbus_properties[] = {
95 DEFINE_PROP_UINT32("irq", TPMStateSysBus, state.irq_num, TPM_TIS_IRQ),
96 DEFINE_PROP_TPMBE("tpmdev", TPMStateSysBus, state.be_driver),
97 DEFINE_PROP_BOOL("ppi", TPMStateSysBus, state.ppi_enabled, true),
98 };
99
100 static void tpm_tis_sysbus_initfn(Object *obj)
101 {
102 TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(obj);
103 TPMState *s = &sbdev->state;
104
105 sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
106 }
107
108 static void tpm_tis_sysbus_realizefn(DeviceState *dev, Error **errp)
109 {
110 TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
111 TPMState *s = &sbdev->state;
112 const size_t host_page_size = qemu_real_host_page_size();
113
114 if (!tpm_find()) {
115 error_setg(errp, "at most one TPM device is permitted");
116 return;
117 }
118
119 if (!s->be_driver) {
120 error_setg(errp, "'tpmdev' property is required");
121 return;
122 }
123
124 memory_region_init_io(&s->mmio, OBJECT(dev), &tpm_tis_memory_ops,
125 s, "tpm-tis-mmio",
126 TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT);
127 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mmio);
128
129 if (s->ppi_enabled) {
130 s->ppi.buf = qemu_memalign(host_page_size,
131 ROUND_UP(TPM_PPI_ADDR_SIZE, host_page_size));
132 memory_region_init_ram_device_ptr(&s->ppi.ram, OBJECT(dev), "tpm-ppi",
133 TPM_PPI_ADDR_SIZE, s->ppi.buf);
134 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->ppi.ram);
135 vmstate_register_ram(&s->ppi.ram, dev);
136 }
137 }
138
139 static void tpm_tis_sysbus_class_init(ObjectClass *klass, const void *data)
140 {
141 DeviceClass *dc = DEVICE_CLASS(klass);
142 TPMIfClass *tc = TPM_IF_CLASS(klass);
143
144 device_class_set_props(dc, tpm_tis_sysbus_properties);
145 dc->vmsd = &vmstate_tpm_tis_sysbus;
146 tc->model = TPM_MODEL_TPM_TIS;
147 tc->ppi_enabled = true;
148 dc->realize = tpm_tis_sysbus_realizefn;
149 device_class_set_legacy_reset(dc, tpm_tis_sysbus_reset);
150 tc->request_completed = tpm_tis_sysbus_request_completed;
151 tc->get_version = tpm_tis_sysbus_get_tpm_version;
152 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
153 }
154
155 static void tpm_tis_sysbus_finalize(Object *obj)
156 {
157 TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(obj);
158 TPMState *s = &sbdev->state;
159
160 qemu_vfree(s->ppi.buf);
161 }
162
163 static const TypeInfo tpm_tis_sysbus_info = {
164 .name = TYPE_TPM_TIS_SYSBUS,
165 .parent = TYPE_DYNAMIC_SYS_BUS_DEVICE,
166 .instance_size = sizeof(TPMStateSysBus),
167 .instance_init = tpm_tis_sysbus_initfn,
168 .instance_finalize = tpm_tis_sysbus_finalize,
169 .class_init = tpm_tis_sysbus_class_init,
170 .interfaces = (const InterfaceInfo[]) {
171 { TYPE_TPM_IF },
172 { }
173 }
174 };
175
176 static void tpm_tis_sysbus_register(void)
177 {
178 type_register_static(&tpm_tis_sysbus_info);
179 }
180
181 type_init(tpm_tis_sysbus_register)