include/hw/timer/npcm7xx_timer.h

   1 /*
   2  * Nuvoton NPCM7xx Timer Controller
   3  *
   4  * Copyright 2020 Google LLC
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  14  * for more details.
  15  */
  16 #ifndef NPCM7XX_TIMER_H
  17 #define NPCM7XX_TIMER_H
  18
  19 #include "exec/memory.h"
  20 #include "hw/sysbus.h"
  21 #include "qemu/timer.h"
  22
  23 /* Each Timer Module (TIM) instance holds five 25 MHz timers. */
  24 #define NPCM7XX_TIMERS_PER_CTRL (5)
  25
  26 /*
  27  * Number of registers in our device state structure. Don't change this without
  28  * incrementing the version_id in the vmstate.
  29  */
  30 #define NPCM7XX_TIMER_NR_REGS (0x54 / sizeof(uint32_t))
  31
  32 /* The basic watchdog timer period is 2^14 clock cycles. */
  33 #define NPCM7XX_WATCHDOG_BASETIME_SHIFT 14
  34
  35 #define NPCM7XX_WATCHDOG_RESET_GPIO_OUT "npcm7xx-clk-watchdog-reset-gpio-out"
  36
  37 typedef struct NPCM7xxTimerCtrlState NPCM7xxTimerCtrlState;
  38
  39 /**
  40  * struct NPCM7xxBaseTimer - Basic functionality that both regular timer and
  41  * watchdog timer use.
  42  * @qtimer: QEMU timer that notifies us on expiration.
  43  * @expires_ns: Absolute virtual expiration time.
  44  * @remaining_ns: Remaining time until expiration if timer is paused.
  45  */
  46 typedef struct NPCM7xxBaseTimer {
  47     QEMUTimer   qtimer;
  48     int64_t     expires_ns;
  49     int64_t     remaining_ns;
  50 } NPCM7xxBaseTimer;
  51
  52 /**
  53  * struct NPCM7xxTimer - Individual timer state.
  54  * @ctrl: The timer module that owns this timer.
  55  * @irq: GIC interrupt line to fire on expiration (if enabled).
  56  * @base_timer: The basic timer functionality for this timer.
  57  * @tcsr: The Timer Control and Status Register.
  58  * @ticr: The Timer Initial Count Register.
  59  */
  60 typedef struct NPCM7xxTimer {
  61     NPCM7xxTimerCtrlState *ctrl;
  62
  63     qemu_irq    irq;
  64     NPCM7xxBaseTimer base_timer;
  65
  66     uint32_t    tcsr;
  67     uint32_t    ticr;
  68 } NPCM7xxTimer;
  69
  70 /**
  71  * struct NPCM7xxWatchdogTimer - The watchdog timer state.
  72  * @ctrl: The timer module that owns this timer.
  73  * @irq: GIC interrupt line to fire on expiration (if enabled).
  74  * @reset_signal: The GPIO used to send a reset signal.
  75  * @base_timer: The basic timer functionality for this timer.
  76  * @wtcr: The Watchdog Timer Control Register.
  77  */
  78 typedef struct NPCM7xxWatchdogTimer {
  79     NPCM7xxTimerCtrlState *ctrl;
  80
  81     qemu_irq            irq;
  82     qemu_irq            reset_signal;
  83     NPCM7xxBaseTimer base_timer;
  84
  85     uint32_t            wtcr;
  86 } NPCM7xxWatchdogTimer;
  87
  88 /**
  89  * struct NPCM7xxTimerCtrlState - Timer Module device state.
  90  * @parent: System bus device.
  91  * @iomem: Memory region through which registers are accessed.
  92  * @index: The index of this timer module.
  93  * @tisr: The Timer Interrupt Status Register.
  94  * @timer: The five individual timers managed by this module.
  95  * @watchdog_timer: The watchdog timer managed by this module.
  96  */
  97 struct NPCM7xxTimerCtrlState {
  98     SysBusDevice parent;
  99
 100     MemoryRegion iomem;
 101
 102     uint32_t    tisr;
 103
 104     NPCM7xxTimer timer[NPCM7XX_TIMERS_PER_CTRL];
 105     NPCM7xxWatchdogTimer watchdog_timer;
 106 };
 107
 108 #define TYPE_NPCM7XX_TIMER "npcm7xx-timer"
 109 #define NPCM7XX_TIMER(obj)                                              \
 110     OBJECT_CHECK(NPCM7xxTimerCtrlState, (obj), TYPE_NPCM7XX_TIMER)
 111
 112 #endif /* NPCM7XX_TIMER_H */