[PATCH] riscv: Add OpenTitan Big Number (OTBN) device address

[Julio Faracco]

This commit adds basics skecthes to implemente a OTBN unit.
OTBN has address 0x50000000 and size 0x400000.
For further reference, see OTBN docummentation:
https://docs.opentitan.org/hw/ip/otbn/doc/

Signed-off-by: Julio Faracco <jcfara...@gmail.com>
---
 hw/riscv/opentitan.c         | 5 ++++-
 include/hw/riscv/opentitan.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/riscv/opentitan.c b/hw/riscv/opentitan.c
index 19223e4c29..8a5d060b57 100644
--- a/hw/riscv/opentitan.c
+++ b/hw/riscv/opentitan.c
@@ -50,7 +50,8 @@ static const struct MemmapEntry {
     [IBEX_ALERT_HANDLER] =  {  0x40130000,  0x10000 },
     [IBEX_NMI_GEN] =        {  0x40140000,  0x10000 },
     [IBEX_USBDEV] =         {  0x40150000,  0x10000 },
-    [IBEX_PADCTRL] =        {  0x40160000,  0x10000 }
+    [IBEX_PADCTRL] =        {  0x40160000,  0x10000 },
+    [IBEX_OTBN] =           {  0x50000000, 0x400000 }
 };
 
 static void opentitan_board_init(MachineState *machine)
@@ -183,6 +184,8 @@ static void lowrisc_ibex_soc_realize(DeviceState *dev_soc, 
Error **errp)
         memmap[IBEX_USBDEV].base, memmap[IBEX_USBDEV].size);
     create_unimplemented_device("riscv.lowrisc.ibex.padctrl",
         memmap[IBEX_PADCTRL].base, memmap[IBEX_PADCTRL].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.otbn",
+        memmap[IBEX_PADCTRL].base, memmap[IBEX_OTBN].size);
 }
 
 static void lowrisc_ibex_soc_class_init(ObjectClass *oc, void *data)
diff --git a/include/hw/riscv/opentitan.h b/include/hw/riscv/opentitan.h
index 8f29b9cbbf..c739d44fbc 100644
--- a/include/hw/riscv/opentitan.h
+++ b/include/hw/riscv/opentitan.h
@@ -68,6 +68,7 @@ enum {
     IBEX_NMI_GEN,
     IBEX_USBDEV,
     IBEX_PADCTRL,
+    IBEX_OTBN,
 };
 
 enum {
-- 
2.25.1