1 /* 2 * Arm SSE Subsystem System Timer 3 * 4 * Copyright (c) 2020 Linaro Limited 5 * Written by Peter Maydell 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 or 9 * (at your option) any later version. 10 */ 11 12 /* 13 * This is a model of the "System timer" which is documented in 14 * the Arm SSE-123 Example Subsystem Technical Reference Manual: 15 * https://developer.arm.com/documentation/101370/latest/ 16 * 17 * QEMU interface: 18 * + QOM property "counter": link property to be set to the 19 * TYPE_SSE_COUNTER timestamp counter device this timer runs off 20 * + sysbus MMIO region 0: the register bank 21 * + sysbus IRQ 0: timer interrupt 22 */ 23 24 #ifndef SSE_TIMER_H 25 #define SSE_TIMER_H 26 27 #include "hw/sysbus.h" 28 #include "qemu/timer.h" 29 #include "qom/object.h" 30 #include "hw/timer/sse-counter.h" 31 32 #define TYPE_SSE_TIMER "sse-timer" 33 OBJECT_DECLARE_SIMPLE_TYPE(SSETimer, SSE_TIMER) 34 35 struct SSETimer { 36 /*< private >*/ 37 SysBusDevice parent_obj; 38 39 /*< public >*/ 40 MemoryRegion iomem; 41 qemu_irq irq; 42 SSECounter *counter; 43 QEMUTimer timer; 44 Notifier counter_notifier; 45 46 uint32_t cntfrq; 47 uint32_t cntp_ctl; 48 uint64_t cntp_cval; 49 uint64_t cntp_aival; 50 uint32_t cntp_aival_ctl; 51 uint32_t cntp_aival_reload; 52 }; 53 54 #endif 55