hw/misc/iotkit-sysctl: Implement IoTKit system control element

The Arm IoTKit includes a system control element which
provides a block of read-only ID registers and a block
of read-write control registers. Implement a minimal
version of this.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180820141116.9118-9-peter.maydell@linaro.org

1 files changed, 49 insertions, 0 deletions

diff --git a/include/hw/misc/iotkit-sysctl.h b/include/hw/misc/iotkit-sysctl.h
new file mode 100644
index 0000000..e36613c
--- /dev/null
+++ b/include/hw/misc/iotkit-sysctl.h
@@ -0,0 +1,49 @@
+/*
+ * ARM IoTKit system control element
+ *
+ * Copyright (c) 2018 Linaro Limited
+ * Written by Peter Maydell
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 or
+ *  (at your option) any later version.
+ */
+
+/*
+ * This is a model of the "system control element" which is part of the
+ * Arm IoTKit and documented in
+ * http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ecm0601256/index.html
+ * Specifically, it implements the "system information block" and
+ * "system control register" blocks.
+ *
+ * QEMU interface:
+ *  + sysbus MMIO region 0: the system information register bank
+ *  + sysbus MMIO region 1: the system control register bank
+ */
+
+#ifndef HW_MISC_IOTKIT_SYSCTL_H
+#define HW_MISC_IOTKIT_SYSCTL_H
+
+#include "hw/sysbus.h"
+
+#define TYPE_IOTKIT_SYSCTL "iotkit-sysctl"
+#define IOTKIT_SYSCTL(obj) OBJECT_CHECK(IoTKitSysCtl, (obj), \
+                                        TYPE_IOTKIT_SYSCTL)
+
+typedef struct IoTKitSysCtl {
+    /*< private >*/
+    SysBusDevice parent_obj;
+
+    /*< public >*/
+    MemoryRegion iomem;
+
+    uint32_t secure_debug;
+    uint32_t reset_syndrome;
+    uint32_t reset_mask;
+    uint32_t gretreg;
+    uint32_t initsvrtor0;
+    uint32_t cpuwait;
+    uint32_t wicctrl;
+} IoTKitSysCtl;
+
+#endif