This logic is similar to TPM TIS ISA device. Since TPM CRB can only
support TPM 2.0 backends, we check for this in realize.

Signed-off-by: Joelle van Dyne <j@getutm.app>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
---
 hw/tpm/tpm_crb.h        |  2 ++
 hw/i386/acpi-build.c    | 23 -----------------------
 hw/tpm/tpm_crb.c        | 16 ++++++++++++++++
 hw/tpm/tpm_crb_common.c | 19 +++++++++++++++++++
 4 files changed, 37 insertions(+), 23 deletions(-)

diff --git a/hw/tpm/tpm_crb.h b/hw/tpm/tpm_crb.h
index 36863e1664..e6a86e3fd1 100644
--- a/hw/tpm/tpm_crb.h
+++ b/hw/tpm/tpm_crb.h
@@ -73,5 +73,7 @@ void tpm_crb_init_memory(Object *obj, TPMCRBState *s, Error **errp);
 void tpm_crb_mem_save(TPMCRBState *s, uint32_t *saved_regs, void *saved_cmdmem);
 void tpm_crb_mem_load(TPMCRBState *s, const uint32_t *saved_regs,
                       const void *saved_cmdmem);
+void tpm_crb_build_aml(TPMIf *ti, Aml *scope, uint32_t baseaddr, uint32_t size,
+                       bool build_ppi);
 
 #endif /* TPM_TPM_CRB_H */
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 80db183b78..ce3f7b2d91 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1441,9 +1441,6 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
     uint32_t nr_mem = machine->ram_slots;
     int root_bus_limit = 0xFF;
     PCIBus *bus = NULL;
-#ifdef CONFIG_TPM
-    TPMIf *tpm = tpm_find();
-#endif
     bool cxl_present = false;
     int i;
     VMBusBridge *vmbus_bridge = vmbus_bridge_find();
@@ -1790,26 +1787,6 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
         }
     }
 
-#ifdef CONFIG_TPM
-    if (TPM_IS_CRB(tpm)) {
-        dev = aml_device("TPM");
-        aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
-        aml_append(dev, aml_name_decl("_STR",
-                                      aml_string("TPM 2.0 Device")));
-        crs = aml_resource_template();
-        aml_append(crs, aml_memory32_fixed(TPM_CRB_ADDR_BASE,
-                                           TPM_CRB_ADDR_SIZE, AML_READ_WRITE));
-        aml_append(dev, aml_name_decl("_CRS", crs));
-
-        aml_append(dev, aml_name_decl("_STA", aml_int(0xf)));
-        aml_append(dev, aml_name_decl("_UID", aml_int(1)));
-
-        tpm_build_ppi_acpi(tpm, dev);
-
-        aml_append(sb_scope, dev);
-    }
-#endif
-
     if (pcms->sgx_epc.size != 0) {
         uint64_t epc_base = pcms->sgx_epc.base;
         uint64_t epc_size = pcms->sgx_epc.size;
diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c
index 99c64dd72a..8d57295b15 100644
--- a/hw/tpm/tpm_crb.c
+++ b/hw/tpm/tpm_crb.c
@@ -19,6 +19,8 @@
 #include "qemu/module.h"
 #include "qapi/error.h"
 #include "exec/address-spaces.h"
+#include "hw/acpi/acpi_aml_interface.h"
+#include "hw/acpi/tpm.h"
 #include "hw/qdev-properties.h"
 #include "hw/pci/pci_ids.h"
 #include "hw/acpi/tpm.h"
@@ -121,6 +123,11 @@ static void tpm_crb_none_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    if (tpm_crb_none_get_version(TPM_IF(s)) != TPM_VERSION_2_0) {
+        error_setg(errp, "TPM CRB only supports TPM 2.0 backends");
+        return;
+    }
+
     tpm_crb_init_memory(OBJECT(s), &s->state, errp);
 
     /* only used for migration */
@@ -142,10 +149,17 @@ static void tpm_crb_none_realize(DeviceState *dev, Error **errp)
     }
 }
 
+static void build_tpm_crb_none_aml(AcpiDevAmlIf *adev, Aml *scope)
+{
+    tpm_crb_build_aml(TPM_IF(adev), scope, TPM_CRB_ADDR_BASE, TPM_CRB_ADDR_SIZE,
+                      true);
+}
+
 static void tpm_crb_none_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     TPMIfClass *tc = TPM_IF_CLASS(klass);
+    AcpiDevAmlIfClass *adevc = ACPI_DEV_AML_IF_CLASS(klass);
 
     dc->realize = tpm_crb_none_realize;
     device_class_set_props(dc, tpm_crb_none_properties);
@@ -154,6 +168,7 @@ static void tpm_crb_none_class_init(ObjectClass *klass, void *data)
     tc->model = TPM_MODEL_TPM_CRB;
     tc->get_version = tpm_crb_none_get_version;
     tc->request_completed = tpm_crb_none_request_completed;
+    adevc->build_dev_aml = build_tpm_crb_none_aml;
 
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 }
@@ -166,6 +181,7 @@ static const TypeInfo tpm_crb_none_info = {
     .class_init  = tpm_crb_none_class_init,
     .interfaces = (InterfaceInfo[]) {
         { TYPE_TPM_IF },
+        { TYPE_ACPI_DEV_AML_IF },
         { }
     }
 };
diff --git a/hw/tpm/tpm_crb_common.c b/hw/tpm/tpm_crb_common.c
index 605e8576e9..4fff0c6b59 100644
--- a/hw/tpm/tpm_crb_common.c
+++ b/hw/tpm/tpm_crb_common.c
@@ -239,3 +239,22 @@ void tpm_crb_mem_load(TPMCRBState *s, const uint32_t *saved_regs,
     memcpy(regs, saved_regs, TPM_CRB_R_MAX);
     memcpy(&regs[R_CRB_DATA_BUFFER], saved_cmdmem, A_CRB_DATA_BUFFER);
 }
+
+void tpm_crb_build_aml(TPMIf *ti, Aml *scope, uint32_t baseaddr, uint32_t size,
+                       bool build_ppi)
+{
+    Aml *dev, *crs;
+
+    dev = aml_device("TPM");
+    aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
+    aml_append(dev, aml_name_decl("_STR", aml_string("TPM 2.0 Device")));
+    aml_append(dev, aml_name_decl("_UID", aml_int(1)));
+    aml_append(dev, aml_name_decl("_STA", aml_int(0xF)));
+    crs = aml_resource_template();
+    aml_append(crs, aml_memory32_fixed(baseaddr, size, AML_READ_WRITE));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    if (build_ppi) {
+        tpm_build_ppi_acpi(ti, dev);
+    }
+    aml_append(scope, dev);
+}
-- 
2.41.0