include/hw/timer/armv7m_systick.h

   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