1 files changed, 59 insertions, 0 deletions
diff --git a/include/hw/timer/sse-timer.h b/include/hw/timer/sse-timer.h
new file mode 100644
index 0000000000..373a944dcd
--- /dev/null
+++ b/include/hw/timer/sse-timer.h
@@ -0,0 +1,59 @@
+/*
+ * Arm SSE Subsystem System Timer
+ *
+ * Copyright (c) 2020 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 timer" which is documented in
+ * the Arm SSE-123 Example Subsystem Technical Reference Manual:
+ * https://developer.arm.com/documentation/101370/latest/
+ *
+ * QEMU interface:
+ *  + Clock input "CLK": clock
+ *  + sysbus MMIO region 0: the register bank
+ *  + sysbus IRQ 0: timer interrupt
+ */
+
+#ifndef SSE_TIMER_H
+#define SSE_TIMER_H
+
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+#define TYPE_SSE_TIMER "sse-timer"
+OBJECT_DECLARE_SIMPLE_TYPE(SSETimer, SSE_TIMER)
+
+struct SSETimer {
+    /*< private >*/
+    SysBusDevice parent_obj;
+
+    /*< public >*/
+    MemoryRegion iomem;
+    qemu_irq irq;
+    Clock *clk;
+    QEMUTimer timer;
+
+    uint32_t cntfrq;
+    uint32_t cntp_ctl;
+    uint64_t cntp_cval;
+    uint64_t cntp_aival;
+    uint32_t cntp_aival_ctl;
+    uint32_t cntp_aival_reload;
+
+    /*
+     * These are used for handling clock frequency changes: they are a
+     * tuple of (QEMU_CLOCK_VIRTUAL timestamp, CNTPCT at that time),
+     * taken when the clock frequency changes. sse_cntpct() needs them
+     * to calculate the current CNTPCT.
+     */
+    uint64_t ns_then;
+    uint64_t ticks_then;
+};
+
+#endif