[Qemu-devel] [PATCH 15/23] hw/arm/armsse: Add unimplemented-device stubs for MHUs

[Peter Maydell <peter.maydell@linaro.org>]

The SSE-200 has two Message Handling Units (MHUs), which sit behind
the APB PPC0. Wire up some unimplemented-device stubs for these,
since we don't yet implement a real model of this device.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/hw/arm/armsse.h |  3 +++
 hw/arm/armsse.c         | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/include/hw/arm/armsse.h b/include/hw/arm/armsse.h
index 999c2e4f7e5..dbfcb280605 100644
--- a/include/hw/arm/armsse.h
+++ b/include/hw/arm/armsse.h
@@ -78,6 +78,7 @@
 #include "hw/watchdog/cmsdk-apb-watchdog.h"
 #include "hw/misc/iotkit-sysctl.h"
 #include "hw/misc/iotkit-sysinfo.h"
+#include "hw/misc/unimp.h"
 #include "hw/or-irq.h"
 #include "hw/core/split-irq.h"
 #include "hw/cpu/cluster.h"
@@ -137,6 +138,8 @@ typedef struct ARMSSE {
     IoTKitSysCtl sysctl;
     IoTKitSysCtl sysinfo;
 
+    UnimplementedDeviceState mhu[2];
+
     /*
      * 'container' holds all devices seen by all CPUs.
      * 'cpu_container[i]' is the view that CPU i has: this has the
diff --git a/hw/arm/armsse.c b/hw/arm/armsse.c
index 19cae77e770..1f3dc89c8e8 100644
--- a/hw/arm/armsse.c
+++ b/hw/arm/armsse.c
@@ -30,6 +30,7 @@ struct ARMSSEInfo {
     int num_cpus;
     uint32_t sys_version;
     SysConfigFormat sys_config_format;
+    bool has_mhus;
 };
 
 static const ARMSSEInfo armsse_variants[] = {
@@ -39,6 +40,7 @@ static const ARMSSEInfo armsse_variants[] = {
         .num_cpus = 1,
         .sys_version = 0x41743,
         .sys_config_format = IoTKitFormat,
+        .has_mhus = false,
     },
 };
 
@@ -257,6 +259,12 @@ static void armsse_init(Object *obj)
                           sizeof(s->sysctl), TYPE_IOTKIT_SYSCTL);
     sysbus_init_child_obj(obj, "armsse-sysinfo", &s->sysinfo,
                           sizeof(s->sysinfo), TYPE_IOTKIT_SYSINFO);
+    if (info->has_mhus) {
+        sysbus_init_child_obj(obj, "mhu0", &s->mhu[0], sizeof(s->mhu[0]),
+                              TYPE_UNIMPLEMENTED_DEVICE);
+        sysbus_init_child_obj(obj, "mhu1", &s->mhu[1], sizeof(s->mhu[1]),
+                              TYPE_UNIMPLEMENTED_DEVICE);
+    }
     object_initialize_child(obj, "nmi-orgate", &s->nmi_orgate,
                             sizeof(s->nmi_orgate), TYPE_OR_IRQ,
                             &error_abort, NULL);
@@ -616,6 +624,8 @@ static void armsse_realize(DeviceState *dev, Error **errp)
      *   0x40000000: timer0
      *   0x40001000: timer1
      *   0x40002000: dual timer
+     *   0x40003000: MHU0 (SSE-200 only)
+     *   0x40004000: MHU1 (SSE-200 only)
      * We must configure and realize each downstream device and connect
      * it to the appropriate PPC port; then we can realize the PPC and
      * map its upstream ends to the right place in the container.
@@ -666,6 +676,31 @@ static void armsse_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    if (info->has_mhus) {
+        for (i = 0; i < ARRAY_SIZE(s->mhu); i++) {
+            char *name = g_strdup_printf("MHU%d", i);
+            char *port = g_strdup_printf("port[%d]", i + 3);
+
+            qdev_prop_set_string(DEVICE(&s->mhu[i]), "name", name);
+            qdev_prop_set_uint64(DEVICE(&s->mhu[i]), "size", 0x1000);
+            object_property_set_bool(OBJECT(&s->mhu[i]), true,
+                                     "realized", &err);
+            if (err) {
+                error_propagate(errp, err);
+                return;
+            }
+            mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->mhu[i]), 0);
+            object_property_set_link(OBJECT(&s->apb_ppc0), OBJECT(mr),
+                                     port, &err);
+            if (err) {
+                error_propagate(errp, err);
+                return;
+            }
+            g_free(name);
+            g_free(port);
+        }
+    }
+
     object_property_set_bool(OBJECT(&s->apb_ppc0), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);
@@ -681,6 +716,12 @@ static void armsse_realize(DeviceState *dev, Error **errp)
     memory_region_add_subregion(&s->container, 0x40001000, mr);
     mr = sysbus_mmio_get_region(sbd_apb_ppc0, 2);
     memory_region_add_subregion(&s->container, 0x40002000, mr);
+    if (info->has_mhus) {
+        mr = sysbus_mmio_get_region(sbd_apb_ppc0, 3);
+        memory_region_add_subregion(&s->container, 0x40003000, mr);
+        mr = sysbus_mmio_get_region(sbd_apb_ppc0, 4);
+        memory_region_add_subregion(&s->container, 0x40004000, mr);
+    }
     for (i = 0; i < IOTS_APB_PPC0_NUM_PORTS; i++) {
         qdev_connect_gpio_out_named(dev_secctl, "apb_ppc0_nonsec", i,
                                     qdev_get_gpio_in_named(dev_apb_ppc0,
-- 
2.20.1