[PATCH v6 2/3] arm/acpi: Add the TPM2.0 device under the DSDT

[Eric Auger <eric.auger@redhat.com>]

In case it is dynamically instantiated, add the TPM 2.0 device object
under the DSDT table in the ACPI namespace. Its HID is MSFT0101
while its current resource settings (CRS) property is initialized
with the guest physical address and MMIO size of the device.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>

---

v3 -> v4:
- check the presence of the tpm in acpi_dsdt_add_tpm
  as it was done in v2

v2 -> v3:
- use SYS_BUS_DEVICE() instead of
  (SysBusDevice *)object_dynamic_cast(OBJECT())

v1 -> v2:
- use memory_region_size
- fix mingw compilation issue by casting to uint32_t
- added Stefan's R-b
---
 hw/arm/virt-acpi-build.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index ca31f70f7f..1384a2cf2a 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -46,6 +46,7 @@
 #include "hw/pci/pci.h"
 #include "hw/arm/virt.h"
 #include "hw/mem/nvdimm.h"
+#include "hw/platform-bus.h"
 #include "sysemu/numa.h"
 #include "sysemu/reset.h"
 #include "sysemu/tpm.h"
@@ -364,6 +365,38 @@ static void acpi_dsdt_add_power_button(Aml *scope)
     aml_append(scope, dev);
 }
 
+static void acpi_dsdt_add_tpm(Aml *scope, VirtMachineState *vms)
+{
+    PlatformBusDevice *pbus = PLATFORM_BUS_DEVICE(vms->platform_bus_dev);
+    hwaddr pbus_base = vms->memmap[VIRT_PLATFORM_BUS].base;
+    SysBusDevice *sbdev = SYS_BUS_DEVICE(tpm_find());
+    MemoryRegion *sbdev_mr;
+    hwaddr tpm_base;
+
+    if (!sbdev) {
+        return;
+    }
+
+    tpm_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
+    assert(tpm_base != -1);
+
+    tpm_base += pbus_base;
+
+    sbdev_mr = sysbus_mmio_get_region(sbdev, 0);
+
+    Aml *dev = aml_device("TPM0");
+    aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
+    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
+
+    Aml *crs = aml_resource_template();
+    aml_append(crs,
+               aml_memory32_fixed(tpm_base,
+                                  (uint32_t)memory_region_size(sbdev_mr),
+                                  AML_READ_WRITE));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
 static void
 build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
 {
@@ -762,6 +795,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
     }
 
     acpi_dsdt_add_power_button(scope);
+    acpi_dsdt_add_tpm(scope, vms);
 
     aml_append(dsdt, scope);
 
-- 
2.20.1