xref: /openbmc/qemu/include/hw/timer/armv7m_systick.h (revision 683754c7)
1 /*
2  * ARMv7M SysTick timer
3  *
4  * Copyright (c) 2006-2007 CodeSourcery.
5  * Written by Paul Brook
6  * Copyright (c) 2017 Linaro Ltd
7  * Written by Peter Maydell
8  *
9  * This code is licensed under the GPL (version 2 or later).
10  */
11 
12 #ifndef HW_TIMER_ARMV7M_SYSTICK_H
13 #define HW_TIMER_ARMV7M_SYSTICK_H
14 
15 #include "hw/sysbus.h"
16 #include "qom/object.h"
17 #include "hw/ptimer.h"
18 #include "hw/clock.h"
19 
20 #define TYPE_SYSTICK "armv7m_systick"
21 
22 OBJECT_DECLARE_SIMPLE_TYPE(SysTickState, SYSTICK)
23 
24 /*
25  * QEMU interface:
26  *  + sysbus MMIO region 0 is the register interface (covering
27  *    the registers which are mapped at address 0xE000E010)
28  *  + sysbus IRQ 0 is the interrupt line to the NVIC
29  *  + Clock input "refclk" is the external reference clock
30  *    (used when SYST_CSR.CLKSOURCE == 0)
31  *  + Clock input "cpuclk" is the main CPU clock
32  *    (used when SYST_CSR.CLKSOURCE == 1)
33  */
34 
35 struct SysTickState {
36     /*< private >*/
37     SysBusDevice parent_obj;
38     /*< public >*/
39 
40     uint32_t control;
41     uint32_t reload;
42     int64_t tick;
43     ptimer_state *ptimer;
44     MemoryRegion iomem;
45     qemu_irq irq;
46     Clock *refclk;
47     Clock *cpuclk;
48 };
49 
50 #endif
51