[PATCH 4/5] hw/misc/allwinner-sid: Support configurable eFuse capacity up to 512 bytes

[Khai Do <dovankhai97@gmail.com>]

Allwinner SoCs provide different eFuse capacities: older SoCs have
16 to 256 bytes, while newer 64-bit SoCs (e.g. H618) provide up to 512
bytes of eFuse storage.

Add a "size" property (defaulting to 16 bytes for backward compatibility)
and an internal storage buffer up to 512 bytes (AW_SID_SIZE_MAX).

Signed-off-by: Khai Do <dovankhai97@gmail.com>
---
 hw/misc/allwinner-sid.c         | 8 +++++++-
 include/hw/misc/allwinner-sid.h | 8 ++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/hw/misc/allwinner-sid.c b/hw/misc/allwinner-sid.c
index b5f827d4bd..0068b07eee 100644
--- a/hw/misc/allwinner-sid.c
+++ b/hw/misc/allwinner-sid.c
@@ -83,6 +83,9 @@ static void allwinner_sid_write(void *opaque, hwaddr offset,
 
             if (id <= sizeof(QemuUUID) - sizeof(s->rdkey)) {
                 s->rdkey = ldl_be_p(&s->identifier.data[id]);
+            } else if (s->size >= sizeof(s->rdkey) &&
+                       id <= s->size - sizeof(s->rdkey)) {
+                s->rdkey = ldl_be_p(&s->storage[id]);
             }
         }
         s->control &= ~REG_PRCTL_WRITE;
@@ -129,16 +132,19 @@ static void allwinner_sid_init(Object *obj)
 
 static const Property allwinner_sid_properties[] = {
     DEFINE_PROP_UUID_NODEFAULT("identifier", AwSidState, identifier),
+    DEFINE_PROP_UINT32("size", AwSidState, size, sizeof(QemuUUID)),
 };
 
 static const VMStateDescription allwinner_sid_vmstate = {
     .name = "allwinner-sid",
-    .version_id = 1,
+    .version_id = 2,
     .minimum_version_id = 1,
     .fields = (const VMStateField[]) {
         VMSTATE_UINT32(control, AwSidState),
         VMSTATE_UINT32(rdkey, AwSidState),
         VMSTATE_UINT8_ARRAY_V(identifier.data, AwSidState, sizeof(QemuUUID), 1),
+        VMSTATE_UINT32_V(size, AwSidState, 2),
+        VMSTATE_UINT8_ARRAY_V(storage, AwSidState, AW_SID_SIZE_MAX, 2),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/include/hw/misc/allwinner-sid.h b/include/hw/misc/allwinner-sid.h
index cfa22a4d7f..da8c235c5d 100644
--- a/include/hw/misc/allwinner-sid.h
+++ b/include/hw/misc/allwinner-sid.h
@@ -24,6 +24,9 @@
 #include "hw/core/sysbus.h"
 #include "qemu/uuid.h"
 
+/** Maximum eFuse storage size supported */
+#define AW_SID_SIZE_MAX (512)
+
 /**
  * Object model
  * @{
@@ -54,6 +57,11 @@ struct AwSidState {
     /** Stores the emulated device identifier */
     QemuUUID identifier;
 
+    /** Size of eFuse storage */
+    uint32_t size;
+
+    /** eFuse storage buffer */
+    uint8_t storage[AW_SID_SIZE_MAX];
 };
 
 #endif /* HW_MISC_ALLWINNER_SID_H */
-- 
2.43.0