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hw/timer/sse-timer: Model the SSE Subsystem System Timer

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The SSE-300 includes some timers which are a different kind to
those in the SSE-200. Model them.

These timers are documented in the SSE-123 Example Subsystem
Technical Reference Manual:
 https://developer.arm.com/documentation/101370/latest/

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210219144617.4782-13-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-02-19 14:45:45 +00:00
parent 0d10df3038
commit 0b8ceee822
7 changed files with 535 additions and 0 deletions
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53
include/hw/timer/sse-timer.h Normal file
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/*
* Arm SSE Subsystem System Timer
*
* Copyright (c) 2020 Linaro Limited
* Written by Peter Maydell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or
* (at your option) any later version.
*/
/*
* This is a model of the "System timer" which is documented in
* the Arm SSE-123 Example Subsystem Technical Reference Manual:
* https://developer.arm.com/documentation/101370/latest/
*
* QEMU interface:
* + QOM property "counter": link property to be set to the
* TYPE_SSE_COUNTER timestamp counter device this timer runs off
* + sysbus MMIO region 0: the register bank
* + sysbus IRQ 0: timer interrupt
*/
#ifndef SSE_TIMER_H
#define SSE_TIMER_H
#include "hw/sysbus.h"
#include "qom/object.h"
#include "hw/timer/sse-counter.h"
#define TYPE_SSE_TIMER "sse-timer"
OBJECT_DECLARE_SIMPLE_TYPE(SSETimer, SSE_TIMER)
struct SSETimer {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
MemoryRegion iomem;
qemu_irq irq;
SSECounter *counter;
QEMUTimer timer;
Notifier counter_notifier;
uint32_t cntfrq;
uint32_t cntp_ctl;
uint64_t cntp_cval;
uint64_t cntp_aival;
uint32_t cntp_aival_ctl;
uint32_t cntp_aival_reload;
};
#endif