From: Ruslan Ruslichenko <Ruslan_Ruslichenko@epam.com>

Add new FDT_GENERIC_MMAP class and interface to allow
devices to register own handlers for mapping memory
regions in device tree's 'reg' property.

Signed-off-by: Ruslan Ruslichenko <Ruslan_Ruslichenko@epam.com>
---
 hw/core/fdt_generic_util.c         | 11 ++++++++
 include/hw/core/fdt_generic_util.h | 44 ++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/hw/core/fdt_generic_util.c b/hw/core/fdt_generic_util.c
index 2c3f4d6b09..c0e974e53a 100644
--- a/hw/core/fdt_generic_util.c
+++ b/hw/core/fdt_generic_util.c
@@ -766,3 +766,14 @@ static int fdt_init_qdev(char *node_path, FDTMachineInfo *fdti, char *compat)
     return 0;
 }
 
+static const TypeInfo fdt_generic_mmap_info = {
+    .name          = TYPE_FDT_GENERIC_MMAP,
+    .parent        = TYPE_INTERFACE,
+    .class_size = sizeof(FDTGenericMMapClass),
+};
+
+static void fdt_generic_register_types(void)
+{
+    type_register_static(&fdt_generic_mmap_info);
+}
+type_init(fdt_generic_register_types)
diff --git a/include/hw/core/fdt_generic_util.h b/include/hw/core/fdt_generic_util.h
index e18c4f9c8b..38086ec1e4 100644
--- a/include/hw/core/fdt_generic_util.h
+++ b/include/hw/core/fdt_generic_util.h
@@ -16,4 +16,48 @@
 
 FDTMachineInfo *fdt_generic_create_machine(void *fdt, qemu_irq *cpu_irq);
 
+#define TYPE_FDT_GENERIC_MMAP "fdt-generic-mmap"
+
+#define FDT_GENERIC_MMAP_CLASS(klass) \
+     OBJECT_CLASS_CHECK(FDTGenericMMapClass, (klass), TYPE_FDT_GENERIC_MMAP)
+#define FDT_GENERIC_MMAP_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(FDTGenericMMapClass, (obj), TYPE_FDT_GENERIC_MMAP)
+#define FDT_GENERIC_MMAP(obj) \
+     INTERFACE_CHECK(FDTGenericMMap, (obj), TYPE_FDT_GENERIC_MMAP)
+
+typedef struct FDTGenericMMap {
+    /*< private >*/
+    Object parent_obj;
+} FDTGenericMMap;
+
+/*
+ * The number of "things" in the tuple. Not to be confused with the cell length
+ * of the tuple (which is variable based on content
+ */
+
+#define FDT_GENERIC_REG_TUPLE_LENGTH 4
+
+typedef struct FDTGenericRegPropInfo {
+    int n;
+    union {
+        struct {
+            uint64_t *a;
+            uint64_t *s;
+            uint64_t *b;
+            uint64_t *p;
+        };
+        uint64_t *x[FDT_GENERIC_REG_TUPLE_LENGTH];
+    };
+    Object **parents;
+} FDTGenericRegPropInfo;
+
+typedef struct FDTGenericMMapClass {
+    /*< private >*/
+    InterfaceClass parent_class;
+
+    /*< public >*/
+    bool (*parse_reg)(FDTGenericMMap *obj, FDTGenericRegPropInfo info,
+                      Error **errp);
+} FDTGenericMMapClass;
+
 #endif /* FDT_GENERIC_UTIL_H */
-- 
2.43.0