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/*
* Nuvoton NPCM7xx Timer Controller
*
* Copyright 2020 Google LLC
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#ifndef NPCM7XX_TIMER_H
#define NPCM7XX_TIMER_H
#include "exec/memory.h"
#include "hw/sysbus.h"
#include "qemu/timer.h"
/* Each Timer Module (TIM) instance holds five 25 MHz timers. */
#define NPCM7XX_TIMERS_PER_CTRL (5)
/*
* Number of registers in our device state structure. Don't change this without
* incrementing the version_id in the vmstate.
*/
#define NPCM7XX_TIMER_NR_REGS (0x54 / sizeof(uint32_t))
/* The basic watchdog timer period is 2^14 clock cycles. */
#define NPCM7XX_WATCHDOG_BASETIME_SHIFT 14
#define NPCM7XX_WATCHDOG_RESET_GPIO_OUT "npcm7xx-clk-watchdog-reset-gpio-out"
typedef struct NPCM7xxTimerCtrlState NPCM7xxTimerCtrlState;
/**
* struct NPCM7xxBaseTimer - Basic functionality that both regular timer and
* watchdog timer use.
* @qtimer: QEMU timer that notifies us on expiration.
* @expires_ns: Absolute virtual expiration time.
* @remaining_ns: Remaining time until expiration if timer is paused.
*/
typedef struct NPCM7xxBaseTimer {
QEMUTimer qtimer;
int64_t expires_ns;
int64_t remaining_ns;
} NPCM7xxBaseTimer;
/**
* struct NPCM7xxTimer - Individual timer state.
* @ctrl: The timer module that owns this timer.
* @irq: GIC interrupt line to fire on expiration (if enabled).
* @base_timer: The basic timer functionality for this timer.
* @tcsr: The Timer Control and Status Register.
* @ticr: The Timer Initial Count Register.
*/
typedef struct NPCM7xxTimer {
NPCM7xxTimerCtrlState *ctrl;
qemu_irq irq;
NPCM7xxBaseTimer base_timer;
uint32_t tcsr;
uint32_t ticr;
} NPCM7xxTimer;
/**
* struct NPCM7xxWatchdogTimer - The watchdog timer state.
* @ctrl: The timer module that owns this timer.
* @irq: GIC interrupt line to fire on expiration (if enabled).
* @reset_signal: The GPIO used to send a reset signal.
* @base_timer: The basic timer functionality for this timer.
* @wtcr: The Watchdog Timer Control Register.
*/
typedef struct NPCM7xxWatchdogTimer {
NPCM7xxTimerCtrlState *ctrl;
qemu_irq irq;
qemu_irq reset_signal;
NPCM7xxBaseTimer base_timer;
uint32_t wtcr;
} NPCM7xxWatchdogTimer;
/**
* struct NPCM7xxTimerCtrlState - Timer Module device state.
* @parent: System bus device.
* @iomem: Memory region through which registers are accessed.
* @index: The index of this timer module.
* @tisr: The Timer Interrupt Status Register.
* @timer: The five individual timers managed by this module.
* @watchdog_timer: The watchdog timer managed by this module.
*/
struct NPCM7xxTimerCtrlState {
SysBusDevice parent;
MemoryRegion iomem;
uint32_t tisr;
NPCM7xxTimer timer[NPCM7XX_TIMERS_PER_CTRL];
NPCM7xxWatchdogTimer watchdog_timer;
};
#define TYPE_NPCM7XX_TIMER "npcm7xx-timer"
#define NPCM7XX_TIMER(obj) \
OBJECT_CHECK(NPCM7xxTimerCtrlState, (obj), TYPE_NPCM7XX_TIMER)
#endif /* NPCM7XX_TIMER_H */
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