hw/tpm/tpm_tis_sysbus.c

   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, Familiy 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
  33 typedef struct TPMStateSysBus {
  34     /*< private >*/
  35     SysBusDevice parent_obj;
  36
  37     /*< public >*/
  38     TPMState state; /* not a QOM object */
  39 } TPMStateSysBus;
  40
  41 #define TPM_TIS_SYSBUS(obj) OBJECT_CHECK(TPMStateSysBus, (obj), TYPE_TPM_TIS_SYSBUS)
  42
  43 static int tpm_tis_pre_save_sysbus(void *opaque)
  44 {
  45     TPMStateSysBus *sbdev = opaque;
  46
  47     return tpm_tis_pre_save(&sbdev->state);
  48 }
  49
  50 static const VMStateDescription vmstate_tpm_tis_sysbus = {
  51     .name = "tpm-tis",
  52     .version_id = 0,
  53     .pre_save  = tpm_tis_pre_save_sysbus,
  54     .fields = (VMStateField[]) {
  55         VMSTATE_BUFFER(state.buffer, TPMStateSysBus),
  56         VMSTATE_UINT16(state.rw_offset, TPMStateSysBus),
  57         VMSTATE_UINT8(state.active_locty, TPMStateSysBus),
  58         VMSTATE_UINT8(state.aborting_locty, TPMStateSysBus),
  59         VMSTATE_UINT8(state.next_locty, TPMStateSysBus),
  60
  61         VMSTATE_STRUCT_ARRAY(state.loc, TPMStateSysBus, TPM_TIS_NUM_LOCALITIES,
  62                              0, vmstate_locty, TPMLocality),
  63
  64         VMSTATE_END_OF_LIST()
  65     }
  66 };
  67
  68 static void tpm_tis_sysbus_request_completed(TPMIf *ti, int ret)
  69 {
  70     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
  71     TPMState *s = &sbdev->state;
  72
  73     tpm_tis_request_completed(s, ret);
  74 }
  75
  76 static enum TPMVersion tpm_tis_sysbus_get_tpm_version(TPMIf *ti)
  77 {
  78     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
  79     TPMState *s = &sbdev->state;
  80
  81     return tpm_tis_get_tpm_version(s);
  82 }
  83
  84 static void tpm_tis_sysbus_reset(DeviceState *dev)
  85 {
  86     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
  87     TPMState *s = &sbdev->state;
  88
  89     return tpm_tis_reset(s);
  90 }
  91
  92 static Property tpm_tis_sysbus_properties[] = {
  93     DEFINE_PROP_UINT32("irq", TPMStateSysBus, state.irq_num, TPM_TIS_IRQ),
  94     DEFINE_PROP_TPMBE("tpmdev", TPMStateSysBus, state.be_driver),
  95     DEFINE_PROP_BOOL("ppi", TPMStateSysBus, state.ppi_enabled, false),
  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     dc->reset = tpm_tis_sysbus_reset;
 139     tc->request_completed = tpm_tis_sysbus_request_completed;
 140     tc->get_version = tpm_tis_sysbus_get_tpm_version;
 141 }
 142
 143 static const TypeInfo tpm_tis_sysbus_info = {
 144     .name = TYPE_TPM_TIS_SYSBUS,
 145     .parent = TYPE_SYS_BUS_DEVICE,
 146     .instance_size = sizeof(TPMStateSysBus),
 147     .instance_init = tpm_tis_sysbus_initfn,
 148     .class_init  = tpm_tis_sysbus_class_init,
 149     .interfaces = (InterfaceInfo[]) {
 150         { TYPE_TPM_IF },
 151         { }
 152     }
 153 };
 154
 155 static void tpm_tis_sysbus_register(void)
 156 {
 157     type_register_static(&tpm_tis_sysbus_info);
 158 }
 159
 160 type_init(tpm_tis_sysbus_register)