xref: /openbmc/qemu/hw/tpm/tpm_tis_isa.c (revision 2e1cacfb)
1 /*
2  * tpm_tis_isa.c - QEMU's TPM TIS ISA 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/isa/isa.h"
27 #include "hw/qdev-properties.h"
28 #include "migration/vmstate.h"
29 #include "hw/acpi/tpm.h"
30 #include "tpm_prop.h"
31 #include "tpm_tis.h"
32 #include "qom/object.h"
33 #include "hw/acpi/acpi_aml_interface.h"
34 
35 struct TPMStateISA {
36     /*< private >*/
37     ISADevice parent_obj;
38 
39     /*< public >*/
40     TPMState state; /* not a QOM object */
41 };
42 
43 OBJECT_DECLARE_SIMPLE_TYPE(TPMStateISA, TPM_TIS_ISA)
44 
45 static int tpm_tis_pre_save_isa(void *opaque)
46 {
47     TPMStateISA *isadev = opaque;
48 
49     return tpm_tis_pre_save(&isadev->state);
50 }
51 
52 static const VMStateDescription vmstate_tpm_tis_isa = {
53     .name = "tpm-tis",
54     .version_id = 0,
55     .pre_save  = tpm_tis_pre_save_isa,
56     .fields = (const VMStateField[]) {
57         VMSTATE_BUFFER(state.buffer, TPMStateISA),
58         VMSTATE_UINT16(state.rw_offset, TPMStateISA),
59         VMSTATE_UINT8(state.active_locty, TPMStateISA),
60         VMSTATE_UINT8(state.aborting_locty, TPMStateISA),
61         VMSTATE_UINT8(state.next_locty, TPMStateISA),
62 
63         VMSTATE_STRUCT_ARRAY(state.loc, TPMStateISA, TPM_TIS_NUM_LOCALITIES, 0,
64                              vmstate_locty, TPMLocality),
65 
66         VMSTATE_END_OF_LIST()
67     }
68 };
69 
70 static void tpm_tis_isa_request_completed(TPMIf *ti, int ret)
71 {
72     TPMStateISA *isadev = TPM_TIS_ISA(ti);
73     TPMState *s = &isadev->state;
74 
75     tpm_tis_request_completed(s, ret);
76 }
77 
78 static enum TPMVersion tpm_tis_isa_get_tpm_version(TPMIf *ti)
79 {
80     TPMStateISA *isadev = TPM_TIS_ISA(ti);
81     TPMState *s = &isadev->state;
82 
83     return tpm_tis_get_tpm_version(s);
84 }
85 
86 static void tpm_tis_isa_reset(DeviceState *dev)
87 {
88     TPMStateISA *isadev = TPM_TIS_ISA(dev);
89     TPMState *s = &isadev->state;
90 
91     return tpm_tis_reset(s);
92 }
93 
94 static Property tpm_tis_isa_properties[] = {
95     DEFINE_PROP_UINT32("irq", TPMStateISA, state.irq_num, TPM_TIS_IRQ),
96     DEFINE_PROP_TPMBE("tpmdev", TPMStateISA, state.be_driver),
97     DEFINE_PROP_BOOL("ppi", TPMStateISA, state.ppi_enabled, true),
98     DEFINE_PROP_END_OF_LIST(),
99 };
100 
101 static void tpm_tis_isa_initfn(Object *obj)
102 {
103     TPMStateISA *isadev = TPM_TIS_ISA(obj);
104     TPMState *s = &isadev->state;
105 
106     memory_region_init_io(&s->mmio, obj, &tpm_tis_memory_ops,
107                           s, "tpm-tis-mmio",
108                           TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT);
109 }
110 
111 static void tpm_tis_isa_realizefn(DeviceState *dev, Error **errp)
112 {
113     TPMStateISA *isadev = TPM_TIS_ISA(dev);
114     TPMState *s = &isadev->state;
115 
116     if (!tpm_find()) {
117         error_setg(errp, "at most one TPM device is permitted");
118         return;
119     }
120 
121     if (!s->be_driver) {
122         error_setg(errp, "'tpmdev' property is required");
123         return;
124     }
125     if (s->irq_num > 15) {
126         error_setg(errp, "IRQ %d is outside valid range of 0 to 15",
127                    s->irq_num);
128         return;
129     }
130 
131     s->irq = isa_get_irq(ISA_DEVICE(dev), s->irq_num);
132 
133     memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)),
134                                 TPM_TIS_ADDR_BASE, &s->mmio);
135 
136     if (s->ppi_enabled) {
137         tpm_ppi_init(&s->ppi, isa_address_space(ISA_DEVICE(dev)),
138                      TPM_PPI_ADDR_BASE, OBJECT(dev));
139     }
140 }
141 
142 static void build_tpm_tis_isa_aml(AcpiDevAmlIf *adev, Aml *scope)
143 {
144     Aml *dev, *crs;
145     TPMStateISA *isadev = TPM_TIS_ISA(adev);
146     TPMIf *ti = TPM_IF(isadev);
147 
148     dev = aml_device("TPM");
149     if (tpm_tis_isa_get_tpm_version(ti) == TPM_VERSION_2_0) {
150         aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
151         aml_append(dev, aml_name_decl("_STR", aml_string("TPM 2.0 Device")));
152     } else {
153         aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0C31")));
154     }
155     aml_append(dev, aml_name_decl("_UID", aml_int(1)));
156     aml_append(dev, aml_name_decl("_STA", aml_int(0xF)));
157     crs = aml_resource_template();
158     aml_append(crs, aml_memory32_fixed(TPM_TIS_ADDR_BASE, TPM_TIS_ADDR_SIZE,
159                                       AML_READ_WRITE));
160     /*
161      * FIXME: TPM_TIS_IRQ=5 conflicts with PNP0C0F irqs,
162      * fix default TPM_TIS_IRQ value there to use some unused IRQ
163      */
164     /* aml_append(crs, aml_irq_no_flags(isadev->state.irq_num)); */
165     aml_append(dev, aml_name_decl("_CRS", crs));
166     tpm_build_ppi_acpi(ti, dev);
167     aml_append(scope, dev);
168 }
169 
170 static void tpm_tis_isa_class_init(ObjectClass *klass, void *data)
171 {
172     DeviceClass *dc = DEVICE_CLASS(klass);
173     TPMIfClass *tc = TPM_IF_CLASS(klass);
174     AcpiDevAmlIfClass *adevc = ACPI_DEV_AML_IF_CLASS(klass);
175 
176     device_class_set_props(dc, tpm_tis_isa_properties);
177     dc->vmsd  = &vmstate_tpm_tis_isa;
178     tc->model = TPM_MODEL_TPM_TIS;
179     dc->realize = tpm_tis_isa_realizefn;
180     device_class_set_legacy_reset(dc, tpm_tis_isa_reset);
181     tc->request_completed = tpm_tis_isa_request_completed;
182     tc->get_version = tpm_tis_isa_get_tpm_version;
183     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
184     adevc->build_dev_aml = build_tpm_tis_isa_aml;
185 }
186 
187 static const TypeInfo tpm_tis_isa_info = {
188     .name = TYPE_TPM_TIS_ISA,
189     .parent = TYPE_ISA_DEVICE,
190     .instance_size = sizeof(TPMStateISA),
191     .instance_init = tpm_tis_isa_initfn,
192     .class_init  = tpm_tis_isa_class_init,
193     .interfaces = (InterfaceInfo[]) {
194         { TYPE_TPM_IF },
195         { TYPE_ACPI_DEV_AML_IF },
196         { }
197     }
198 };
199 
200 static void tpm_tis_isa_register(void)
201 {
202     type_register_static(&tpm_tis_isa_info);
203 }
204 
205 type_init(tpm_tis_isa_register)
206