hw/intc/armv7m_nvic: Provide default "reset the system" behaviour for SYSRESETREQ
[qemu.git] / include / hw / timer / cmsdk-apb-dualtimer.h
1 /*
2 * ARM CMSDK APB dual-timer emulation
3 *
4 * Copyright (c) 2018 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 "APB dual-input timer" which is part of the Cortex-M
14 * System Design Kit (CMSDK) and documented in the Cortex-M System
15 * Design Kit Technical Reference Manual (ARM DDI0479C):
16 * https://developer.arm.com/products/system-design/system-design-kits/cortex-m-system-design-kit
17 *
18 * QEMU interface:
19 * + QOM property "pclk-frq": frequency at which the timer is clocked
20 * + sysbus MMIO region 0: the register bank
21 * + sysbus IRQ 0: combined timer interrupt TIMINTC
22 * + sysbus IRO 1: timer block 1 interrupt TIMINT1
23 * + sysbus IRQ 2: timer block 2 interrupt TIMINT2
24 */
25
26 #ifndef CMSDK_APB_DUALTIMER_H
27 #define CMSDK_APB_DUALTIMER_H
28
29 #include "hw/sysbus.h"
30 #include "hw/ptimer.h"
31
32 #define TYPE_CMSDK_APB_DUALTIMER "cmsdk-apb-dualtimer"
33 #define CMSDK_APB_DUALTIMER(obj) OBJECT_CHECK(CMSDKAPBDualTimer, (obj), \
34 TYPE_CMSDK_APB_DUALTIMER)
35
36 typedef struct CMSDKAPBDualTimer CMSDKAPBDualTimer;
37
38 /* One of the two identical timer modules in the dual-timer module */
39 typedef struct CMSDKAPBDualTimerModule {
40 CMSDKAPBDualTimer *parent;
41 struct ptimer_state *timer;
42 qemu_irq timerint;
43 /*
44 * We must track the guest LOAD and VALUE register state by hand
45 * rather than leaving this state only in the ptimer limit/count,
46 * because if CONTROL.SIZE is 0 then only the low 16 bits of the
47 * counter actually counts, but the high half is still guest
48 * accessible.
49 */
50 uint32_t load;
51 uint32_t value;
52 uint32_t control;
53 uint32_t intstatus;
54 } CMSDKAPBDualTimerModule;
55
56 #define CMSDK_APB_DUALTIMER_NUM_MODULES 2
57
58 struct CMSDKAPBDualTimer {
59 /*< private >*/
60 SysBusDevice parent_obj;
61
62 /*< public >*/
63 MemoryRegion iomem;
64 qemu_irq timerintc;
65 uint32_t pclk_frq;
66
67 CMSDKAPBDualTimerModule timermod[CMSDK_APB_DUALTIMER_NUM_MODULES];
68 uint32_t timeritcr;
69 uint32_t timeritop;
70 };
71
72 #endif