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 "tpm_util.h"
  29 #include "hw/sysbus.h"
  30 #include "tpm_tis.h"
  31
  32 typedef struct TPMStateSysBus {
  33     /*< private >*/
  34     SysBusDevice parent_obj;
  35
  36     /*< public >*/
  37     TPMState state; /* not a QOM object */
  38 } TPMStateSysBus;
  39
  40 #define TPM_TIS_SYSBUS(obj) OBJECT_CHECK(TPMStateSysBus, (obj), TYPE_TPM_TIS_SYSBUS)
  41
  42 static int tpm_tis_pre_save_sysbus(void *opaque)
  43 {
  44     TPMStateSysBus *sbdev = opaque;
  45
  46     return tpm_tis_pre_save(&sbdev->state);
  47 }
  48
  49 static const VMStateDescription vmstate_tpm_tis_sysbus = {
  50     .name = "tpm-tis",
  51     .version_id = 0,
  52     .pre_save  = tpm_tis_pre_save_sysbus,
  53     .fields = (VMStateField[]) {
  54         VMSTATE_BUFFER(state.buffer, TPMStateSysBus),
  55         VMSTATE_UINT16(state.rw_offset, TPMStateSysBus),
  56         VMSTATE_UINT8(state.active_locty, TPMStateSysBus),
  57         VMSTATE_UINT8(state.aborting_locty, TPMStateSysBus),
  58         VMSTATE_UINT8(state.next_locty, TPMStateSysBus),
  59
  60         VMSTATE_STRUCT_ARRAY(state.loc, TPMStateSysBus, TPM_TIS_NUM_LOCALITIES,
  61                              0, vmstate_locty, TPMLocality),
  62
  63         VMSTATE_END_OF_LIST()
  64     }
  65 };
  66
  67 static void tpm_tis_sysbus_request_completed(TPMIf *ti, int ret)
  68 {
  69     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
  70     TPMState *s = &sbdev->state;
  71
  72     tpm_tis_request_completed(s, ret);
  73 }
  74
  75 static enum TPMVersion tpm_tis_sysbus_get_tpm_version(TPMIf *ti)
  76 {
  77     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
  78     TPMState *s = &sbdev->state;
  79
  80     return tpm_tis_get_tpm_version(s);
  81 }
  82
  83 static void tpm_tis_sysbus_reset(DeviceState *dev)
  84 {
  85     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
  86     TPMState *s = &sbdev->state;
  87
  88     return tpm_tis_reset(s);
  89 }
  90
  91 static Property tpm_tis_sysbus_properties[] = {
  92     DEFINE_PROP_UINT32("irq", TPMStateSysBus, state.irq_num, TPM_TIS_IRQ),
  93     DEFINE_PROP_TPMBE("tpmdev", TPMStateSysBus, state.be_driver),
  94     DEFINE_PROP_BOOL("ppi", TPMStateSysBus, state.ppi_enabled, true),
  95     DEFINE_PROP_END_OF_LIST(),
  96 };
  97
  98 static void tpm_tis_sysbus_initfn(Object *obj)
  99 {
 100     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(obj);
 101     TPMState *s = &sbdev->state;
 102
 103     memory_region_init_io(&s->mmio, obj, &tpm_tis_memory_ops,
 104                           s, "tpm-tis-mmio",
 105                           TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT);
 106
 107     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
 108     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
 109 }
 110
 111 static void tpm_tis_sysbus_realizefn(DeviceState *dev, Error **errp)
 112 {
 113     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
 114     TPMState *s = &sbdev->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 }
 126
 127 static void tpm_tis_sysbus_class_init(ObjectClass *klass, void *data)
 128 {
 129     DeviceClass *dc = DEVICE_CLASS(klass);
 130     TPMIfClass *tc = TPM_IF_CLASS(klass);
 131
 132     device_class_set_props(dc, tpm_tis_sysbus_properties);
 133     dc->vmsd  = &vmstate_tpm_tis_sysbus;
 134     tc->model = TPM_MODEL_TPM_TIS;
 135     dc->realize = tpm_tis_sysbus_realizefn;
 136     dc->user_creatable = true;
 137     dc->reset = tpm_tis_sysbus_reset;
 138     tc->request_completed = tpm_tis_sysbus_request_completed;
 139     tc->get_version = tpm_tis_sysbus_get_tpm_version;
 140 }
 141
 142 static const TypeInfo tpm_tis_sysbus_info = {
 143     .name = TYPE_TPM_TIS_SYSBUS,
 144     .parent = TYPE_SYS_BUS_DEVICE,
 145     .instance_size = sizeof(TPMStateSysBus),
 146     .instance_init = tpm_tis_sysbus_initfn,
 147     .class_init  = tpm_tis_sysbus_class_init,
 148     .interfaces = (InterfaceInfo[]) {
 149         { TYPE_TPM_IF },
 150         { }
 151     }
 152 };
 153
 154 static void tpm_tis_sysbus_register(void)
 155 {
 156     type_register_static(&tpm_tis_sysbus_info);
 157 }
 158
 159 type_init(tpm_tis_sysbus_register)